pyflink.table package¶

Module contents¶

Entry point classes of Flink Table API:

TableEnvironment and StreamTableEnvironment Main entry point for Flink Table API & SQL functionality. TableEnvironment is used in pure Table API & SQL jobs. Meanwhile, StreamTableEnvironment needs to be used when mixing use of Table API and DataStream API.

Table The core component of the Table API. Use the methods of Table to transform data.

StatementSet The core component of the Table API. It’s used to create jobs with multiple sinks.

EnvironmentSettings Defines all the parameters used to initialize a TableEnvironment.

TableConfig A config to define the runtime behavior of the Table API. It is used together with pyflink.datastream.StreamExecutionEnvironment to create StreamTableEnvironment.

Classes to define user-defined functions:

ScalarFunction Base interface for user-defined scalar function.

TableFunction Base interface for user-defined table function.

AggregateFunction Base interface for user-defined aggregate function.

TableAggregateFunction Base interface for user-defined table aggregate function.

FunctionContext Used to obtain global runtime information about the context in which the user-defined function is executed, such as the metric group, and global job parameters, etc.

Classes to define window:

window.GroupWindow Group windows group rows based on time or row-count intervals. See window.Tumble, window.Session and window.Slide for more details on how to create a tumble window, session window, hop window separately.

window.OverWindow Over window aggregates compute an aggregate for each input row over a range of its neighboring rows. See window.Over for more details on how to create an over window.

Classes for catalog:

catalog.Catalog Responsible for reading and writing metadata such as database/table/views/UDFs from and to a catalog.

catalog.HiveCatalog Responsible for reading and writing metadata stored in Hive.

Classes to define source & sink:

TableDescriptor TableDescriptor is a template for creating a CatalogTable instance. It closely resembles the “CREATE TABLE” SQL DDL statement, containing schema, connector options, and other characteristics. Since tables in Flink are typically backed by external systems, the descriptor describes how a connector (and possibly its format) are configured.

FormatDescriptor Describes a format and its options for use with TableDescriptor.

Schema Describes the schema for use with TableDescriptor. It represents the schema part of a CREATE TABLE (schema) WITH (options) DDL statement in SQL. It defines columns of different kind, constraints, time attributes, and watermark strategies. It is possible to reference objects (such as functions or types) across different catalogs.

Classes for module:

Module Defines a set of metadata, including functions, user defined types, operators, rules, etc. Metadata from modules are regarded as built-in or system metadata that users can take advantages of.

module.HiveModule Implementation of Module to provide Hive built-in metadata.

Other important classes:

DataTypes Defines a list of data types available in Table API.

Expression Represents a logical tree for producing a computation result for a column in a Table. Might be literal values, function calls, or field references.

TableSchema Represents a table’s structure with field names and data types.

SqlDialect Enumeration of valid SQL compatibility modes.

ChangelogMode The set of changes contained in a changelog.

ExplainDetail Defines the types of details for explain result.

class pyflink.table.AggregateFunction(*args, **kwds)[source]¶

Bases: pyflink.table.udf.ImperativeAggregateFunction

Base interface for user-defined aggregate function. A user-defined aggregate function maps scalar values of multiple rows to a new scalar value.

New in version 1.12.0.

abstract get_value(accumulator: ACC) → T[source]¶

Called every time when an aggregation result should be materialized. The returned value could be either an early and incomplete result (periodically emitted as data arrives) or the final result of the aggregation.

Parameters: accumulator – the accumulator which contains the current intermediate results
Returns: the aggregation result

class pyflink.table.ChangelogMode(j_changelog_mode)[source]¶

Bases: object

The set of changes contained in a changelog.

static all()[source]¶

static insert_only()[source]¶

static upsert()[source]¶

class pyflink.table.CsvTableSink(field_names, field_types, path, field_delimiter=',', num_files=- 1, write_mode=None)[source]¶

Bases: pyflink.table.sinks.TableSink

A simple TableSink to emit data as CSV files.

Example:

>>> CsvTableSink(["a", "b"], [DataTypes.INT(), DataTypes.STRING()],
...              "/csv/file/path", "|", 1, WriteMode.OVERWRITE)

Parameters

field_names – The list of field names.
field_types – The list of field data types.
path – The output path to write the Table to.
field_delimiter – The field delimiter.
num_files – The number of files to write to.
write_mode – The write mode to specify whether existing files are overwritten or not, which contains: WriteMode.NO_OVERWRITE and WriteMode.OVERWRITE.

class pyflink.table.CsvTableSource(source_path, field_names, field_types, field_delim=None, line_delim=None, quote_character=None, ignore_first_line=None, ignore_comments=None, lenient=None, empty_column_as_null=None)[source]¶

Bases: pyflink.table.sources.TableSource

A TableSource for simple CSV files with a (logically) unlimited number of fields.

Example:

>>> CsvTableSource("/csv/file/path", ["a", "b"], [DataTypes.INT(), DataTypes.STRING()])

Parameters

source_path (str) – The path to the CSV file.
field_names (collections.Iterable[str]) – The names of the table fields.
field_types (collections.Iterable[str]) – The types of the table fields.
field_delim (str, optional) – The field delimiter, “,” by default.
line_delim (str, optional) – The row delimiter, “n” by default.
quote_character (str, optional) – An optional quote character for String values, null by default.
ignore_first_line (bool, optional) – Flag to ignore the first line, false by default.
ignore_comments (str, optional) – An optional prefix to indicate comments, null by default.
lenient (bool, optional) – Flag to skip records with parse error instead to fail, false by default.
empty_column_as_null (bool, optional) – Treat empty column as null, false by default.

class pyflink.table.DataTypes[source]¶

Bases: object

A DataType can be used to declare input and/or output types of operations. This class enumerates all supported data types of the Table & SQL API.

static ARRAY(element_type: pyflink.table.types.DataType, nullable: bool = True) → pyflink.table.types.ArrayType[source]¶

Data type of an array of elements with same subtype.

Compared to the SQL standard, the maximum cardinality of an array cannot be specified but is fixed at 2147483647(0x7fffffff). Also, any valid type is supported as a subtype.

Parameters

element_type – DataType of each element in the array.
nullable – boolean, whether the type can be null (None) or not.

static BIGINT(nullable: bool = True) → pyflink.table.types.BigIntType[source]¶

Data type of an 8-byte signed integer with values from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807.

Parameters: nullable – boolean, whether the type can be null (None) or not.

static BINARY(length: int, nullable: bool = True) → pyflink.table.types.BinaryType[source]¶

Data type of a fixed-length binary string (=a sequence of bytes).

Parameters

length – int, the number of bytes. It must have a value between 1 and 2147483647(0x7fffffff) (both inclusive).
nullable – boolean, whether the type can be null (None) or not.

Note

BinaryType is still not supported yet.

static BOOLEAN(nullable: bool = True) → pyflink.table.types.BooleanType[source]¶

Data type of a boolean with a (possibly) three-valued logic of TRUE, FALSE, UNKNOWN.

Parameters: nullable – boolean, whether the type can be null (None) or not.

static BYTES(nullable: bool = True) → pyflink.table.types.VarBinaryType[source]¶

Data type of a variable-length binary string (=a sequence of bytes) with defined maximum length. This is a shortcut for DataTypes.VARBINARY(2147483647).

Parameters: nullable – boolean, whether the type can be null (None) or not.

See also

VARBINARY()

static CHAR(length: int, nullable: bool = True) → pyflink.table.types.CharType[source]¶

Data type of a fixed-length character string.

Parameters

length – int, the string representation length. It must have a value between 1 and 2147483647(0x7fffffff) (both inclusive).
nullable – boolean, whether the type can be null (None) or not.

Note

CharType is still not supported yet.

static DATE(nullable: bool = True) → pyflink.table.types.DateType[source]¶

Data type of a date consisting of year-month-day with values ranging from 0000-01-01 to 9999-12-31.

Compared to the SQL standard, the range starts at year 0000.

Parameters: nullable – boolean, whether the type can be null (None) or not.

static DAY(precision: int = 2) → pyflink.table.types.Resolution[source]¶

Resolution in days.

Parameters: precision – int, the number of digits of days. It must have a value between 1 and 6 (both inclusive), (default: 2).
Returns: the specified Resolution.

See also

INTERVAL()

static DECIMAL(precision: int, scale: int, nullable: bool = True) → pyflink.table.types.DecimalType[source]¶

Data type of a decimal number with fixed precision and scale.

Parameters

precision – the number of digits in a number. It must have a value between 1 and 38 (both inclusive).
scale – the number of digits on right side of dot. It must have a value between 0 and precision (both inclusive).
nullable – boolean, whether the type can be null (None) or not.

Note

The precision must be 38 and the scale must be 18 currently.

static DOUBLE(nullable: bool = True) → pyflink.table.types.DoubleType[source]¶

Data type of an 8-byte double precision floating point number.

Parameters: nullable – boolean, whether the type can be null (None) or not.

static FIELD(name: str, data_type: pyflink.table.types.DataType, description: str = None) → pyflink.table.types.RowField[source]¶

Field definition with field name, data type, and a description.

Parameters

name – string, name of the field.
data_type – DataType of the field.
description – string, description of the field.

static FLOAT(nullable: bool = True) → pyflink.table.types.FloatType[source]¶

Data type of a 4-byte single precision floating point number.

Parameters: nullable – boolean, whether the type can be null (None) or not.

static HOUR() → pyflink.table.types.Resolution[source]¶

Resolution in hours.

Returns: Resolution

See also

INTERVAL()

static INT(nullable: bool = True) → pyflink.table.types.IntType[source]¶

Data type of a 2-byte signed integer with values from -2,147,483,648 to 2,147,483,647.

Parameters: nullable – boolean, whether the type can be null (None) or not.

static INTERVAL(upper_resolution: pyflink.table.types.Resolution, lower_resolution: pyflink.table.types.Resolution = None) → Union[pyflink.table.types.DayTimeIntervalType, pyflink.table.types.YearMonthIntervalType][source]¶

Data type of a temporal interval. There are two types of temporal intervals: day-time intervals with up to nanosecond granularity or year-month intervals with up to month granularity.

An interval of day-time consists of +days hours:months:seconds.fractional with values ranging from -999999 23:59:59.999999999 to +999999 23:59:59.999999999. The type must be parameterized to one of the following resolutions: interval of days, interval of days to hours, interval of days to minutes, interval of days to seconds, interval of hours, interval of hours to minutes, interval of hours to seconds, interval of minutes, interval of minutes to seconds, or interval of seconds. The value representation is the same for all types of resolutions. For example, an interval of seconds of 70 is always represented in an interval-of-days-to-seconds format (with default precisions): +00 00:01:10.000000.

An interval of year-month consists of +years-months with values ranging from -9999-11 to +9999-11. The type must be parameterized to one of the following resolutions: interval of years, interval of years to months, or interval of months. The value representation is the same for all types of resolutions. For example, an interval of months of 50 is always represented in an interval-of-years-to-months format (with default year precision): +04-02.

Examples: INTERVAL(DAY(2), SECOND(9)) for a day-time interval or INTERVAL(YEAR(4), MONTH()) for a year-month interval.

Parameters

upper_resolution – Resolution, the upper resolution of the interval.
lower_resolution – Resolution, the lower resolution of the interval.

Note

the upper_resolution must be MONTH for YearMonthIntervalType, SECOND for DayTimeIntervalType and the lower_resolution must be None currently.

See also

See also

See also

See also

See also

See also

static LIST_VIEW(element_type: pyflink.table.types.DataType) → pyflink.table.types.ListViewType[source]¶

Data type of a pyflink.table.data_view.ListView.

It can only be used in accumulator type declaration of an Aggregate Function.

Parameters: element_type – DataType of each element in the list view.

static MAP(key_type: pyflink.table.types.DataType, value_type: pyflink.table.types.DataType, nullable: bool = True) → pyflink.table.types.MapType[source]¶

Data type of an associative array that maps keys to values. A map cannot contain duplicate keys; each key can map to at most one value.

There is no restriction of key types; it is the responsibility of the user to ensure uniqueness. The map type is an extension to the SQL standard.

Parameters

key_type – DataType of the keys in the map.
value_type – DataType of the values in the map.
nullable – boolean, whether the type can be null (None) or not.

static MAP_VIEW(key_type: pyflink.table.types.DataType, value_type: pyflink.table.types.DataType) → pyflink.table.types.MapViewType[source]¶

Data type of a pyflink.table.data_view.ListView.

It can only be used in accumulator type declaration of an Aggregate Function.

Parameters

key_type – DataType of the keys in the map view.
value_type – DataType of the values in the map view.

static MINUTE() → pyflink.table.types.Resolution[source]¶

Resolution in minutes.

Returns: the specified Resolution.

See also

INTERVAL()

static MONTH() → pyflink.table.types.Resolution[source]¶

Resolution in months.

Returns: the specified Resolution.

See also

INTERVAL()

static MULTISET(element_type: pyflink.table.types.DataType, nullable: bool = True) → pyflink.table.types.MultisetType[source]¶

Data type of a multiset (=bag). Unlike a set, it allows for multiple instances for each of its elements with a common subtype. Each unique value is mapped to some multiplicity.

There is no restriction of element types; it is the responsibility of the user to ensure uniqueness.

Parameters

element_type – DataType of each element in the multiset.
nullable – boolean, whether the type can be null (None) or not.

static NULL() → pyflink.table.types.NullType[source]¶

Data type for representing untyped null (None) values. A null type has no other value except null (None), thus, it can be cast to any nullable type.

This type helps in representing unknown types in API calls that use a null (None) literal as well as bridging to formats such as JSON or Avro that define such a type as well.

The null type is an extension to the SQL standard.

Note

NullType is still not supported yet.

static ROW(row_fields: List = [], nullable: bool = True) → pyflink.table.types.RowType[source]¶

Data type of a sequence of fields. A field consists of a field name, field type, and an optional description. The most specific type of a row of a table is a row type. In this case, each column of the row corresponds to the field of the row type that has the same ordinal position as the column.

Compared to the SQL standard, an optional field description simplifies the handling with complex structures.

Parameters

row_fields – a list of row field types which can be created via DataTypes.FIELD().
nullable – boolean, whether the type can be null (None) or not.

static SECOND(precision: int = 6) → pyflink.table.types.Resolution[source]¶

Resolution in seconds and (possibly) fractional seconds.

Parameters: precision – int, the number of digits of fractional seconds. It must have a value between 0 and 9 (both inclusive), (default: 6).
Returns: the specified Resolution.

Note

the precision must be 3 currently.

See also

INTERVAL()

static SMALLINT(nullable: bool = True) → pyflink.table.types.SmallIntType[source]¶

Data type of a 2-byte signed integer with values from -32,768 to 32,767.

Parameters: nullable – boolean, whether the type can be null (None) or not.

static STRING(nullable: bool = True) → pyflink.table.types.VarCharType[source]¶

Data type of a variable-length character string with defined maximum length. This is a shortcut for DataTypes.VARCHAR(2147483647).

Parameters: nullable – boolean, whether the type can be null (None) or not.

See also

VARCHAR()

static TIME(precision: int = 0, nullable: bool = True) → pyflink.table.types.TimeType[source]¶

Data type of a time WITHOUT time zone.

An instance consists of hour:minute:second[.fractional with up to nanosecond precision and values ranging from 00:00:00.000000000 to 23:59:59.999999999.

Compared to the SQL standard, leap seconds (23:59:60 and 23:59:61) are not supported.

Parameters

precision – int, the number of digits of fractional seconds. It must have a value between 0 and 9 (both inclusive).
nullable – boolean, whether the type can be null (None) or not.

Note

The precision must be 0 currently.

static TIMESTAMP(precision: int = 6, nullable: bool = True) → pyflink.table.types.TimestampType[source]¶

Data type of a timestamp WITHOUT time zone.

An instance consists of year-month-day hour:minute:second[.fractional with up to nanosecond precision and values ranging from 0000-01-01 00:00:00.000000000 to 9999-12-31 23:59:59.999999999.

Compared to the SQL standard, leap seconds (23:59:60 and 23:59:61) are not supported.

This class does not store or represent a time-zone. Instead, it is a description of the date, as used for birthdays, combined with the local time as seen on a wall clock. It cannot represent an instant on the time-line without additional information such as an offset or time-zone.

Parameters

precision – int, the number of digits of fractional seconds. It must have a value between 0 and 9 (both inclusive). (default: 6)
nullable – boolean, whether the type can be null (None) or not.

Note

The precision must be 3 currently.

static TIMESTAMP_LTZ(precision: int = 6, nullable: bool = True) → pyflink.table.types.LocalZonedTimestampType[source]¶

Data type of a timestamp WITH LOCAL time zone. This is a shortcut for DataTypes.TIMESTAMP_WITH_LOCAL_TIME_ZONE(precision, nullable).

Parameters

precision – int, the number of digits of fractional seconds. It must have a value between 0 and 9 (both inclusive). (default: 6, only supports 3 when bridged to DataStream)
nullable – boolean, whether the type can be null (None) or not.

See also

TIMESTAMP_WITH_LOCAL_TIME_ZONE(precision, nullable)()

static TIMESTAMP_WITH_LOCAL_TIME_ZONE(precision: int = 6, nullable: bool = True) → pyflink.table.types.LocalZonedTimestampType[source]¶

Data type of a timestamp WITH LOCAL time zone.

An instance consists of year-month-day hour:minute:second[.fractional with up to nanosecond precision and values ranging from 0000-01-01 00:00:00.000000000 +14:59 to 9999-12-31 23:59:59.999999999 -14:59.

Compared to the SQL standard, leap seconds (23:59:60 and 23:59:61) are not supported.

The value will be stored internally as a long value which stores all date and time fields, to a precision of nanoseconds, as well as the offset from UTC/Greenwich.

Parameters

precision – int, the number of digits of fractional seconds. It must have a value between 0 and 9 (both inclusive). (default: 6)
nullable – boolean, whether the type can be null (None) or not.

Note

LocalZonedTimestampType only supports precision of 3 currently.

static TINYINT(nullable: bool = True) → pyflink.table.types.TinyIntType[source]¶

Data type of a 1-byte signed integer with values from -128 to 127.

Parameters: nullable – boolean, whether the type can be null (None) or not.

static VARBINARY(length: int, nullable: bool = True) → pyflink.table.types.VarBinaryType[source]¶

Data type of a variable-length binary string (=a sequence of bytes)

Parameters

length – int, the maximum number of bytes. It must have a value between 1 and 2147483647(0x7fffffff) (both inclusive).
nullable – boolean, whether the type can be null (None) or not.

Note

The length limit must be 0x7fffffff(2147483647) currently.

See also

BYTES()

static VARCHAR(length: int, nullable: bool = True) → pyflink.table.types.VarCharType[source]¶

Data type of a variable-length character string.

Parameters

length – int, the maximum string representation length. It must have a value between 1 and 2147483647(0x7fffffff) (both inclusive).
nullable – boolean, whether the type can be null (None) or not.

Note

The length limit must be 0x7fffffff(2147483647) currently.

See also

STRING()

static YEAR(precision: int = 2) → pyflink.table.types.Resolution[source]¶

Resolution in years with 2 digits for the number of years by default.

Parameters: precision – the number of digits of years. It must have a value between 1 and 4 (both inclusive), (default 2).
Returns: the specified Resolution.

See also

INTERVAL()

class pyflink.table.DataView[source]¶

Bases: abc.ABC

A DataView is a collection type that can be used in the accumulator of an user defined pyflink.table.AggregateFunction. Depending on the context in which the function is used, a DataView can be backed by a normal collection or a state backend.

abstract clear() → None[source]¶: Clears the DataView and removes all data.

class pyflink.table.EnvironmentSettings(j_environment_settings)[source]¶

Bases: object

Defines all parameters that initialize a table environment. Those parameters are used only during instantiation of a TableEnvironment and cannot be changed afterwards.

Example:

>>> EnvironmentSettings.new_instance() \
...     .in_streaming_mode() \
...     .with_built_in_catalog_name("my_catalog") \
...     .with_built_in_database_name("my_database") \
...     .build()

in_streaming_mode() or in_batch_mode() might be convenient as shortcuts.

class Builder[source]¶

Bases: object

A builder for EnvironmentSettings.

build() → pyflink.table.environment_settings.EnvironmentSettings[source]¶

Returns an immutable instance of EnvironmentSettings.

Returns: an immutable instance of EnvironmentSettings.

in_batch_mode() → pyflink.table.environment_settings.EnvironmentSettings.Builder[source]¶

Sets that the components should work in a batch mode. Streaming mode by default.

Returns: This object.

in_streaming_mode() → pyflink.table.environment_settings.EnvironmentSettings.Builder[source]¶

Sets that the components should work in a streaming mode. Enabled by default.

Returns: This object.

with_built_in_catalog_name(built_in_catalog_name: str) → pyflink.table.environment_settings.EnvironmentSettings.Builder[source]¶

Specifies the name of the initial catalog to be created when instantiating a TableEnvironment.

This catalog is an in-memory catalog that will be used to store all temporary objects (e.g. from create_temporary_view() or create_temporary_system_function()) that cannot be persisted because they have no serializable representation.

It will also be the initial value for the current catalog which can be altered via use_catalog().

Default: “default_catalog”.

Parameters: built_in_catalog_name – The specified built-in catalog name.
Returns: This object.

with_built_in_database_name(built_in_database_name: str) → pyflink.table.environment_settings.EnvironmentSettings.Builder[source]¶

Specifies the name of the default database in the initial catalog to be created when instantiating a TableEnvironment.

This database is an in-memory database that will be used to store all temporary objects (e.g. from create_temporary_view() or create_temporary_system_function()) that cannot be persisted because they have no serializable representation.

It will also be the initial value for the current catalog which can be altered via use_catalog().

Default: “default_database”.

Parameters: built_in_database_name – The specified built-in database name.
Returns: This object.

with_configuration(config: pyflink.common.configuration.Configuration) → pyflink.table.environment_settings.EnvironmentSettings.Builder[source]¶

Creates the EnvironmentSetting with specified Configuration.

Returns: EnvironmentSettings.

static from_configuration(config: pyflink.common.configuration.Configuration) → pyflink.table.environment_settings.EnvironmentSettings[source]¶

Creates the EnvironmentSetting with specified Configuration.

Returns: EnvironmentSettings.

Note

Deprecated in 1.15. Please use EnvironmentSettings.Builder.with_configuration() instead.

get_built_in_catalog_name() → str[source]¶

Gets the specified name of the initial catalog to be created when instantiating a TableEnvironment.

Returns: The specified name of the initial catalog to be created.

get_built_in_database_name() → str[source]¶

Gets the specified name of the default database in the initial catalog to be created when instantiating a TableEnvironment.

Returns: The specified name of the default database in the initial catalog to be created.

get_configuration() → pyflink.common.configuration.Configuration[source]¶

Get the underlying pyflink.common.Configuration.

Returns: Configuration with specified value.

static in_batch_mode() → pyflink.table.environment_settings.EnvironmentSettings[source]¶

Creates a default instance of EnvironmentSettings in batch execution mode.

This mode is highly optimized for batch scenarios. Only bounded data streams can be processed in this mode.

This method is a shortcut for creating a TableEnvironment with little code. Use the builder provided in EnvironmentSettings.new_instance() for advanced settings.

Returns: EnvironmentSettings.

static in_streaming_mode() → pyflink.table.environment_settings.EnvironmentSettings[source]¶

Creates a default instance of EnvironmentSettings in streaming execution mode.

In this mode, both bounded and unbounded data streams can be processed.

This method is a shortcut for creating a TableEnvironment with little code. Use the builder provided in EnvironmentSettings.new_instance() for advanced settings.

Returns: EnvironmentSettings.

is_streaming_mode() → bool[source]¶

Tells if the TableEnvironment should work in a batch or streaming mode.

Returns: True if the TableEnvironment should work in a streaming mode, false otherwise.

static new_instance() → pyflink.table.environment_settings.EnvironmentSettings.Builder[source]¶

Creates a builder for creating an instance of EnvironmentSettings.

Returns: A builder of EnvironmentSettings.

to_configuration() → pyflink.common.configuration.Configuration[source]¶

Convert to pyflink.common.Configuration.

Returns: Configuration with specified value.

Note

Deprecated in 1.15. Please use EnvironmentSettings.get_configuration() instead.

class pyflink.table.ExplainDetail[source]¶

Bases: object

ExplainDetail defines the types of details for explain result.

New in version 1.11.0.

CHANGELOG_MODE = 1¶

ESTIMATED_COST = 0¶

JSON_EXECUTION_PLAN = 2¶

class pyflink.table.Expression(*args, **kwds)[source]¶

Bases: typing.Generic

Expressions represent a logical tree for producing a computation result. Expressions might be literal values, function calls, or field references.

New in version 1.12.0.

property abs¶: Calculates the absolute value of given value.

New in version 1.12.0.

property acos¶: Calculates the arc cosine of a given number.

See also

sin, cos, sinh, cosh, tan, cot, asin, acos, atan, tanh

New in version 1.12.0.

alias(name: str, *extra_names: str) → pyflink.table.expression.Expression[T][source]¶

Specifies a name for an expression i.e. a field.

Example:

>>> tab.select(col('a').alias('b'))

Parameters

name – name for one field.
extra_names – additional names if the expression expands to multiple fields

New in version 1.12.0.

array_contains(needle) → pyflink.table.expression.Expression[source]¶

Returns whether the given element exists in an array.

Checking for null elements in the array is supported. If the array itself is null, the function will return null. The given element is cast implicitly to the array’s element type if necessary.

New in version 1.12.0.

property asc¶

Specifies ascending order of an expression i.e. a field for order_by.

Example:

>>> tab.order_by(col('a').asc)

See also

desc

New in version 1.12.0.

property ascii¶: Returns the numeric value of the first character of the input string.

New in version 1.12.0.

property asin¶: Calculates the arc sine of a given number.

See also

sin, cos, sinh, cosh, tan, cot, asin, acos, atan, tanh

New in version 1.12.0.

at(index) → pyflink.table.expression.Expression[source]¶

Accesses the element of an array or map based on a key or an index (starting at 1).

Parameters: index – index key or position of the element (array index starting at 1)

See also

cardinality, element

New in version 1.12.0.

property atan¶: Calculates the arc tangent of a given number.

See also

sin, cos, sinh, cosh, tan, cot, asin, acos, atan, tanh

New in version 1.12.0.

property avg¶

Returns the average (arithmetic mean) of the numeric field across all input values.

Example:

>>> tab \
>>>     .group_by(col("a")) \
>>>     .select(col("a"),
>>>             col("b").sum.alias("d"),
>>>             col("b").sum0.alias("e"),
>>>             col("b").min.alias("f"),
>>>             col("b").max.alias("g"),
>>>             col("b").count.alias("h"),
>>>             col("b").avg.alias("i"),
>>>             col("b").stddev_pop.alias("j"),
>>>             col("b").stddev_samp.alias("k"),
>>>             col("b").var_pop.alias("l"),
>>>             col("b").var_samp.alias("m"),
>>>             col("b").collect.alias("n"))

New in version 1.12.0.

between(lower_bound, upper_bound) → pyflink.table.expression.Expression[bool][source]¶

Returns true if the given expression is between lower_bound and upper_bound (both inclusive). False otherwise. The parameters must be numeric types or identical comparable types.

e.g. lit(2.1).between(2.1, 2.1) leads to true, lit(“2018-05-05”).to_date.between(lit(“2018-05-01”).to_date, lit(“2018-05-10”).to_date) leads to true.

Parameters

lower_bound – numeric or comparable expression
upper_bound – numeric or comparable expression

See also

not_between()

New in version 1.12.0.

property bin¶: Returns a string representation of an integer numeric value in binary format. Returns null if numeric is null. E.g. “4” leads to “100”, “12” leads to “1100”.

See also

hex

New in version 1.12.0.

property cardinality¶: Returns the number of elements of an array or number of entries of a map.

See also

at(), element

New in version 1.12.0.

cast(data_type: pyflink.table.types.DataType) → pyflink.table.expression.Expression[source]¶

Returns a new value being cast to type type. A cast error throws an exception and fails the job. When performing a cast operation that may fail, like STRING to INT, one should rather use try_cast, in order to handle errors. If “table.exec.legacy-cast-behaviour” is enabled, cast behaves like try_cast.

E.g. lit(“4”).cast(DataTypes.INT()) returns 42; lit(null).cast(DataTypes.STRING()) returns NULL of type STRING; lit(“non-number”).cast(DataTypes.INT()) throws an exception and fails the job.

New in version 1.12.0.

ceil(time_interval_unit: pyflink.table.expression.TimeIntervalUnit = None) → pyflink.table.expression.Expression[source]¶: If time_interval_unit is specified, it rounds up a time point to the given unit, e.g. lit(“12:44:31”).to_date.floor(TimeIntervalUnit.MINUTE) leads to 12:45:00. Otherwise, it calculates the smallest integer greater than or equal to a given number.

See also

to_date, to_time, to_timestamp, extract(), floor(), ceil()

New in version 1.12.0.

property char_length¶: Returns the length of a string.

See also

trim_leading(), trim_trailing(), trim(), replace(), char_length, upper_case, lower_case, init_cap, like(), similar(), position(), lpad(), rpad(), overlay(), regexp_replace(), regexp_extract(), substring(), from_base64, to_base64, ltrim, rtrim, repeat()

New in version 1.12.0.

property chr¶: Returns the ASCII character result of the input integer.

New in version 1.12.0.

property collect¶

Returns multiset aggregate of a given expression.

Example:

>>> tab \
>>>     .group_by(col("a")) \
>>>     .select(col("a"),
>>>             col("b").sum.alias("d"),
>>>             col("b").sum0.alias("e"),
>>>             col("b").min.alias("f"),
>>>             col("b").max.alias("g"),
>>>             col("b").count.alias("h"),
>>>             col("b").avg.alias("i"),
>>>             col("b").stddev_pop.alias("j"),
>>>             col("b").stddev_samp.alias("k"),
>>>             col("b").var_pop.alias("l"),
>>>             col("b").var_samp.alias("m"),
>>>             col("b").collect.alias("n"))

New in version 1.12.0.

property cos¶: Calculates the cosine of a given number.

See also

sin, cos, sinh, cosh, tan, cot, asin, acos, atan, tanh

New in version 1.12.0.

property cosh¶: Calculates the hyperbolic cosine of a given number.

See also

sin, cos, sinh, cosh, tan, cot, asin, acos, atan, tanh

New in version 1.12.0.

property cot¶: Calculates the cotangent of a given number.

See also

sin, cos, sinh, cosh, tan, cot, asin, acos, atan, tanh

New in version 1.12.0.

property count¶

Returns the number of input rows for which the field is not null.

Example:

>>> tab \
>>>     .group_by(col("a")) \
>>>     .select(col("a"),
>>>             col("b").sum.alias("d"),
>>>             col("b").sum0.alias("e"),
>>>             col("b").min.alias("f"),
>>>             col("b").max.alias("g"),
>>>             col("b").count.alias("h"),
>>>             col("b").avg.alias("i"),
>>>             col("b").stddev_pop.alias("j"),
>>>             col("b").stddev_samp.alias("k"),
>>>             col("b").var_pop.alias("l"),
>>>             col("b").var_samp.alias("m"),
>>>             col("b").collect.alias("n"))

New in version 1.12.0.

property day¶

Creates an interval of the given number of days.

The produced expression is of type INTERVAL().

New in version 1.12.0.

property days¶

Creates an interval of the given number of days.

The produced expression is of type INTERVAL().

New in version 1.12.0.

decode(charset: Union[str, Expression[str]]) → pyflink.table.expression.Expression[str][source]¶: Decodes the first argument into a String using the provided character set.

New in version 1.12.0.

property degrees¶: Converts numeric from radians to degrees.

See also

radians

New in version 1.12.0.

property desc¶

Specifies descending order of an expression i.e. a field for order_by.

Example:

>>> tab.order_by(col('a').desc)

See also

asc

New in version 1.12.0.

property distinct¶

Similar to a SQL distinct aggregation clause such as COUNT(DISTINCT a), declares that an aggregation function is only applied on distinct input values.

Example:

>>> tab \
>>>     .group_by(col("a")) \
>>>     .select(col("a"), col("b").sum.distinct.alias("d"))

New in version 1.12.0.

property element¶: Returns the sole element of an array with a single element. Returns null if the array is empty. Throws an exception if the array has more than one element.

See also

at(), cardinality

New in version 1.12.0.

encode(charset: Union[str, Expression[str]]) → pyflink.table.expression.Expression[bytes][source]¶: Encodes the string into a BINARY using the provided character set.

New in version 1.12.0.

property end¶

Returns the end time (exclusive) of a window when applied on a window reference.

e.g. if a window ends at 10:59:59.999 this property will return 11:00:00.000.

Example:

>>> orders.window(Tumble
>>>             .over(row_interval(2))
>>>             .on(col("a"))
>>>             .alias("w")) \
>>>     .group_by(col("c"), col("w")) \
>>>     .select(col("c"), col("w").start, col("w").end, col("w").proctime)

See also

start

New in version 1.12.0.

property exp¶: Calculates the Euler’s number raised to the given power.

New in version 1.12.0.

extract(time_interval_unit: pyflink.table.expression.TimeIntervalUnit) → pyflink.table.expression.Expression[source]¶: Extracts parts of a time point or time interval. Returns the part as a long value. e.g. lit(“2006-06-05”).to_date.extract(TimeIntervalUnit.DAY) leads to 5.

See also

to_date, to_time, to_timestamp, extract(), floor(), ceil()

New in version 1.12.0.

property first_value¶: Returns the first value of field across all input values.

New in version 1.12.0.

property flatten¶: Converts a Flink composite type (such as Tuple, POJO, etc.) and all of its direct subtypes into a flat representation where every subtype is a separate field.

See also

get()

New in version 1.12.0.

floor(time_interval_unit: pyflink.table.expression.TimeIntervalUnit = None) → pyflink.table.expression.Expression[source]¶: If time_interval_unit is specified, it rounds down a time point to the given unit, e.g. lit(“12:44:31”).to_date.floor(TimeIntervalUnit.MINUTE) leads to 12:44:00. Otherwise, it calculates the largest integer less than or equal to a given number.

See also

to_date, to_time, to_timestamp, extract(), floor(), ceil()

New in version 1.12.0.

property from_base64¶: Returns the base string decoded with base64.

See also

trim_leading(), trim_trailing(), trim(), replace(), char_length, upper_case, lower_case, init_cap, like(), similar(), position(), lpad(), rpad(), overlay(), regexp_replace(), regexp_extract(), substring(), from_base64, to_base64, ltrim, rtrim, repeat()

New in version 1.12.0.

get(name_or_index: Union[str, int]) → pyflink.table.expression.Expression[source]¶

Accesses the field of a Flink composite type (such as Tuple, POJO, etc.) by name or index and returns it’s value.

Parameters: name_or_index – name or index of the field (similar to Flink’s field expressions)

See also

flatten

New in version 1.12.0.

property hex¶

Returns a string representation of an integer numeric value or a string in hex format. Returns null if numeric or string is null.

E.g. a numeric 20 leads to “14”, a numeric 100 leads to “64”, and a string “hello,world” leads to “68656c6c6f2c776f726c64”.

See also

bin

New in version 1.12.0.

property hour¶

Creates an interval of the given number of hours.

The produced expression is of type INTERVAL().

New in version 1.12.0.

property hours¶

Creates an interval of the given number of hours.

The produced expression is of type INTERVAL().

New in version 1.12.0.

if_null(null_replacement) → pyflink.table.expression.Expression[source]¶

Returns null_replacement if the given expression is null; otherwise the expression is returned.

This function returns a data type that is very specific in terms of nullability. The returned type is the common type of both arguments but only nullable if the null_replacement is nullable.

The function allows to pass nullable columns into a function or table that is declared with a NOT NULL constraint.

e.g. col(“nullable_column”).if_null(5) returns never null.

New in version 1.12.0.

in_(first_element_or_table, *remaining_elements) → pyflink.table.expression.Expression[source]¶

If first_element_or_table is a Table, Returns true if an expression exists in a given table sub-query. The sub-query table must consist of one column. This column must have the same data type as the expression.

Note

This operation is not supported in a streaming environment yet if first_element_or_table is a Table.

Otherwise, Returns true if an expression exists in a given list of expressions. This is a shorthand for multiple OR conditions.

If the testing set contains null, the result will be null if the element can not be found and true if it can be found. If the element is null, the result is always null.

e.g. lit(“42”).in(1, 2, 3) leads to false.

Example:

>>> tab.where(col("a").in_(1, 2, 3))
>>> table_a.where(col("x").in_(table_b.select(col("y"))))

New in version 1.12.0.

property init_cap¶: Converts the initial letter of each word in a string to uppercase. Assumes a string containing only [A-Za-z0-9], everything else is treated as whitespace.

See also

trim_leading(), trim_trailing(), trim(), replace(), char_length, upper_case, lower_case, init_cap, like(), similar(), position(), lpad(), rpad(), overlay(), regexp_replace(), regexp_extract(), substring(), from_base64, to_base64, ltrim, rtrim, repeat()

New in version 1.12.0.

instr(s: Union[str, Expression[str]]) → pyflink.table.expression.Expression[int][source]¶: Returns the position of the first occurrence in the input string.

New in version 1.12.0.

property is_false¶: Returns true if given boolean expression is false. False otherwise (for null and true).

See also

is_true, is_not_true, is_not_false

New in version 1.12.0.

is_json(json_type: pyflink.table.expression.JsonType = None) → pyflink.table.expression.Expression[bool][source]¶

Determine whether a given string is valid JSON.

Specifying the optional json_type argument puts a constraint on which type of JSON object is allowed. If the string is valid JSON, but not that type, false is returned. The default is JsonType.VALUE.

Examples:

>>> lit('1').is_json() # True
>>> lit('[]').is_json() # True
>>> lit('{}').is_json() # True

>>> lit('"abc"').is_json() # True
>>> lit('abc').is_json() # False
>>> null_of(DataTypes.STRING()).is_json() # False

>>> lit('1').is_json(JsonType.SCALAR) # True
>>> lit('1').is_json(JsonType.ARRAY) # False
>>> lit('1').is_json(JsonType.OBJECT) # False

>>> lit('{}').is_json(JsonType.SCALAR) # False
>>> lit('{}').is_json(JsonType.ARRAY) # False
>>> lit('{}').is_json(JsonType.OBJECT) # True

New in version 1.12.0.

property is_not_false¶: Returns true if given boolean expression is not false (for null and true). False otherwise.

See also

is_true, is_false, is_not_true

New in version 1.12.0.

property is_not_null¶: Returns true if the given expression is not null.

See also

is_null

New in version 1.12.0.

property is_not_true¶: Returns true if given boolean expression is not true (for null and false). False otherwise.

See also

is_true, is_false, is_not_false

New in version 1.12.0.

property is_null¶: Returns true if the given expression is null.

See also

is_not_null

New in version 1.12.0.

property is_true¶: Returns true if given boolean expression is true. False otherwise (for null and false).

See also

is_false, is_not_true, is_not_false

New in version 1.12.0.

json_exists(path: str, on_error: pyflink.table.expression.JsonExistsOnError = None) → pyflink.table.expression.Expression[bool][source]¶

Determines whether a JSON string satisfies a given search criterion.

This follows the ISO/IEC TR 19075-6 specification for JSON support in SQL.

Examples:

>>> lit('{"a": true}').json_exists('$.a') # True
>>> lit('{"a": true}').json_exists('$.b') # False
>>> lit('{"a": [{ "b": 1 }]}').json_exists('$.a[0].b') # True

>>> lit('{"a": true}').json_exists('strict $.b', JsonExistsOnError.TRUE) # True
>>> lit('{"a": true}').json_exists('strict $.b', JsonExistsOnError.FALSE) # False

New in version 1.12.0.

json_query(path: str, wrapping_behavior=<JsonQueryWrapper.WITHOUT_ARRAY: (0, )>, on_empty=<JsonQueryOnEmptyOrError.NULL: (0, )>, on_error=<JsonQueryOnEmptyOrError.NULL: (0, )>) → pyflink.table.expression.Expression[source]¶

Extracts JSON values from a JSON string.

This follows the ISO/IEC TR 19075-6 specification for JSON support in SQL. The result is always returned as a STRING.

The wrapping_behavior determines whether the extracted value should be wrapped into an array, and whether to do so unconditionally or only if the value itself isn’t an array already.

on_empty and on_error determine the behavior in case the path expression is empty, or in case an error was raised, respectively. By default, in both cases null is returned. Other choices are to use an empty array, an empty object, or to raise an error.

seealso:: json_value()

Examples:

>>> lit('{"a":{"b":1}}').json_query('$.a') # '{"b":1}'
>>> lit('[1,2]').json_query('$') # '[1,2]'
>>> null_of(DataTypes.STRING()).json_query('$') # None

>>> lit('{}').json_query('$', JsonQueryWrapper.CONDITIONAL_ARRAY) # '[{}]'
>>> lit('[1,2]').json_query('$', JsonQueryWrapper.CONDITIONAL_ARRAY) # '[1,2]'
>>> lit('[1,2]').json_query('$', JsonQueryWrapper.UNCONDITIONAL_ARRAY) # '[[1,2]]'

>>> lit(1).json_query('$') # null
>>> lit(1).json_query('$', JsonQueryWrapper.CONDITIONAL_ARRAY) # '[1]'

>>> lit('{}').json_query('lax $.invalid', JsonQueryWrapper.WITHOUT_ARRAY,                                      JsonQueryOnEmptyOrError.EMPTY_OBJECT,                                     JsonQueryOnEmptyOrError.NULL) # '{}'
>>> lit('{}').json_query('strict $.invalid', JsonQueryWrapper.WITHOUT_ARRAY,                                      JsonQueryOnEmptyOrError.NULL,                                      JsonQueryOnEmptyOrError.EMPTY_ARRAY) # '[]'

New in version 1.12.0.

json_value(path: str, returning_type: pyflink.table.types.DataType = VarCharType(2147483647, true), on_empty: pyflink.table.expression.JsonValueOnEmptyOrError = <JsonValueOnEmptyOrError.NULL: (0, )>, default_on_empty: Any = None, on_error: pyflink.table.expression.JsonValueOnEmptyOrError = <JsonValueOnEmptyOrError.NULL: (0, )>, default_on_error: Any = None) → pyflink.table.expression.Expression[source]¶

Extracts a scalar from a JSON string.

This method searches a JSON string for a given path expression and returns the value if the value at that path is scalar. Non-scalar values cannot be returned. By default, the value is returned as DataTypes.STRING(). Using returningType a different type can be chosen, with the following types being supported:

STRING
BOOLEAN
INT
DOUBLE

For empty path expressions or errors a behavior can be defined to either return null, raise an error or return a defined default value instead.

seealso:: json_query()

Examples:

>>> lit('{"a": true}').json_value('$.a') # STRING: 'true'
>>> lit('{"a.b": [0.998,0.996]}').json_value("$.['a.b'][0]",                     DataTypes.DOUBLE()) # DOUBLE: 0.998
>>> lit('{"a": true}').json_value('$.a', DataTypes.BOOLEAN()) # BOOLEAN: True
>>> lit('{"a": true}').json_value('lax $.b',                     JsonValueOnEmptyOrError.DEFAULT, False) # BOOLEAN: False
>>> lit('{"a": true}').json_value('strict $.b',                     JsonValueOnEmptyOrError.NULL, None,                     JsonValueOnEmptyOrError.DEFAULT, False) # BOOLEAN: False

New in version 1.12.0.

property last_value¶: Returns the last value of field across all input values.

New in version 1.12.0.

left(length: Union[int, Expression[int]]) → pyflink.table.expression.Expression[str][source]¶: Returns the leftmost integer characters from the input string.

New in version 1.12.0.

like(pattern: Union[str, Expression[str]] = None) → pyflink.table.expression.Expression[bool][source]¶: Returns true, if a string matches the specified LIKE pattern. e.g. ‘Jo_n%’ matches all strings that start with ‘Jo(arbitrary letter)n’

See also

trim_leading(), trim_trailing(), trim(), replace(), char_length, upper_case, lower_case, init_cap, like(), similar(), position(), lpad(), rpad(), overlay(), regexp_replace(), regexp_extract(), substring(), from_base64, to_base64, ltrim, rtrim, repeat()

New in version 1.12.0.

property ln¶: Calculates the natural logarithm of the given value.

See also

log10, log2, ln, log()

New in version 1.12.0.

locate(s: Union[str, Expression[str]], pos: Union[int, Expression[int]] = None) → pyflink.table.expression.Expression[int][source]¶: Returns the position of the first occurrence in the input string after position integer.

New in version 1.12.0.

log(base=None) → pyflink.table.expression.Expression[float][source]¶: Calculates the natural logarithm of the given value if base is not specified. Otherwise, calculates the logarithm of the given value to the given base.

See also

log10, log2, ln, log()

New in version 1.12.0.

property log10¶: Calculates the base 10 logarithm of the given value.

See also

log10, log2, ln, log()

New in version 1.12.0.

property log2¶: Calculates the base 2 logarithm of the given value.

See also

log10, log2, ln, log()

New in version 1.12.0.

property lower_case¶: Returns all of the characters in a string in lower case using the rules of the default locale.

See also

trim_leading(), trim_trailing(), trim(), replace(), char_length, upper_case, lower_case, init_cap, like(), similar(), position(), lpad(), rpad(), overlay(), regexp_replace(), regexp_extract(), substring(), from_base64, to_base64, ltrim, rtrim, repeat()

New in version 1.12.0.

lpad(length: Union[int, Expression[int]], pad: Union[str, Expression[str]]) → pyflink.table.expression.Expression[str][source]¶: Returns a string left-padded with the given pad string to a length of len characters. If the string is longer than len, the return value is shortened to len characters. e.g. lit(‘hi’).lpad(4, ‘??’) returns ‘??hi’, lit(‘hi’).lpad(1, ‘??’) returns ‘h’

See also

trim_leading(), trim_trailing(), trim(), replace(), char_length, upper_case, lower_case, init_cap, like(), similar(), position(), lpad(), rpad(), overlay(), regexp_replace(), regexp_extract(), substring(), from_base64, to_base64, ltrim, rtrim, repeat()

New in version 1.12.0.

property ltrim¶: Returns a string that removes the left whitespaces from the given string.

See also

trim_leading(), trim_trailing(), trim(), replace(), char_length, upper_case, lower_case, init_cap, like(), similar(), position(), lpad(), rpad(), overlay(), regexp_replace(), regexp_extract(), substring(), from_base64, to_base64, ltrim, rtrim, repeat()

New in version 1.12.0.

property max¶

Returns the maximum value of field across all input values.

Example:

>>> tab \
>>>     .group_by(col("a")) \
>>>     .select(col("a"),
>>>             col("b").sum.alias("d"),
>>>             col("b").sum0.alias("e"),
>>>             col("b").min.alias("f"),
>>>             col("b").max.alias("g"),
>>>             col("b").count.alias("h"),
>>>             col("b").avg.alias("i"),
>>>             col("b").stddev_pop.alias("j"),
>>>             col("b").stddev_samp.alias("k"),
>>>             col("b").var_pop.alias("l"),
>>>             col("b").var_samp.alias("m"),
>>>             col("b").collect.alias("n"))

New in version 1.12.0.

property md5¶

Returns the MD5 hash of the string argument; null if string is null.

Returns: string of 32 hexadecimal digits or null.

New in version 1.12.0.

property milli¶

Creates an interval of the given number of millis.

The produced expression is of type INTERVAL().

New in version 1.12.0.

property millis¶

Creates an interval of the given number of millis.

The produced expression is of type INTERVAL().

New in version 1.12.0.

property min¶

Returns the minimum value of field across all input values.

Example:

>>> tab \
>>>     .group_by(col("a")) \
>>>     .select(col("a"),
>>>             col("b").sum.alias("d"),
>>>             col("b").sum0.alias("e"),
>>>             col("b").min.alias("f"),
>>>             col("b").max.alias("g"),
>>>             col("b").count.alias("h"),
>>>             col("b").avg.alias("i"),
>>>             col("b").stddev_pop.alias("j"),
>>>             col("b").stddev_samp.alias("k"),
>>>             col("b").var_pop.alias("l"),
>>>             col("b").var_samp.alias("m"),
>>>             col("b").collect.alias("n"))

New in version 1.12.0.

property minute¶

Creates an interval of the given number of minutes.

The produced expression is of type INTERVAL().

New in version 1.12.0.

property minutes¶

Creates an interval of the given number of minutes.

The produced expression is of type INTERVAL().

New in version 1.12.0.

property month¶

Creates an interval of the given number of months.

The produced expression is of type INTERVAL().

New in version 1.12.0.

property months¶

Creates an interval of the given number of months.

The produced expression is of type INTERVAL().

New in version 1.12.0.

not_between(lower_bound, upper_bound) → pyflink.table.expression.Expression[bool][source]¶

Returns true if the given expression is not between lower_bound and upper_bound (both inclusive). False otherwise. The parameters must be numeric types or identical comparable types.

e.g. lit(2.1).not_between(2.1, 2.1) leads to false, lit(“2018-05-05”).to_date.not_between(lit(“2018-05-01”).to_date, lit(“2018-05-10”).to_date) leads to false.

Parameters

lower_bound – numeric or comparable expression
upper_bound – numeric or comparable expression

See also

between()

New in version 1.12.0.

over(alias) → pyflink.table.expression.Expression[source]¶

Defines an aggregation to be used for a previously specified over window.

Example:

>>> tab.window(Over
>>>         .partition_by(col('c'))
>>>         .order_by(col('rowtime'))
>>>         .preceding(row_interval(2))
>>>         .following(CURRENT_ROW)
>>>         .alias("w")) \
>>>     .select(col('c'), col('a'), col('a').count.over(col('w')))

New in version 1.12.0.

overlay(new_string: Union[str, Expression[str]], starting: Union[int, Expression[int]], length: Union[int, Expression[int]] = None) → pyflink.table.expression.Expression[str][source]¶: Replaces a substring of string with a string starting at a position (starting at 1). e.g. lit(‘xxxxxtest’).overlay(‘xxxx’, 6) leads to ‘xxxxxxxxx’ lit(‘xxxxxtest’).overlay(‘xxxx’, 6, 2) leads to ‘xxxxxxxxxst’

See also

trim_leading(), trim_trailing(), trim(), replace(), char_length, upper_case, lower_case, init_cap, like(), similar(), position(), lpad(), rpad(), overlay(), regexp_replace(), regexp_extract(), substring(), from_base64, to_base64, ltrim, rtrim, repeat()

New in version 1.12.0.

parse_url(part_to_extract: Union[str, Expression[str]], key: Union[str, Expression[str]] = None) → pyflink.table.expression.Expression[str][source]¶: Parse url and return various parameter of the URL. If accept any null arguments, return null.

New in version 1.12.0.

position(haystack: Union[str, Expression[str]] = None) → pyflink.table.expression.Expression[int][source]¶: Returns the position of string in an other string starting at 1. Returns 0 if string could not be found. e.g. lit(‘a’).position(‘bbbbba’) leads to 6.

See also

trim_leading(), trim_trailing(), trim(), replace(), char_length, upper_case, lower_case, init_cap, like(), similar(), position(), lpad(), rpad(), overlay(), regexp_replace(), regexp_extract(), substring(), from_base64, to_base64, ltrim, rtrim, repeat()

New in version 1.12.0.

property proctime¶: Declares a field as the proctime attribute for indicating, accessing, and working in Flink’s processing time.

See also

proctime

New in version 1.12.0.

property quarter¶

Creates an interval of the given number of quarters.

The produced expression is of type INTERVAL().

New in version 1.12.0.

property quarters¶

Creates an interval of the given number of quarters.

The produced expression is of type INTERVAL().

New in version 1.12.0.

property radians¶: Converts numeric from degrees to radians.

See also

degrees

New in version 1.12.0.

regexp(regex: Union[str, Expression[str]]) → pyflink.table.expression.Expression[str][source]¶: Returns True if any (possibly empty) substring matches the regular expression, otherwise False. Returns None if any of arguments is None.

New in version 1.12.0.

regexp_extract(regex: Union[str, Expression[str]], extract_index: Union[int, Expression[int]] = None) → pyflink.table.expression.Expression[str][source]¶: Returns a string extracted with a specified regular expression and a regex match group index.

See also

trim_leading(), trim_trailing(), trim(), replace(), char_length, upper_case, lower_case, init_cap, like(), similar(), position(), lpad(), rpad(), overlay(), regexp_replace(), regexp_extract(), substring(), from_base64, to_base64, ltrim, rtrim, repeat()

New in version 1.12.0.

regexp_replace(regex: Union[str, Expression[str]], replacement: Union[str, Expression[str]]) → pyflink.table.expression.Expression[str][source]¶: Returns a string with all substrings that match the regular expression consecutively being replaced.

See also

trim_leading(), trim_trailing(), trim(), replace(), char_length, upper_case, lower_case, init_cap, like(), similar(), position(), lpad(), rpad(), overlay(), regexp_replace(), regexp_extract(), substring(), from_base64, to_base64, ltrim, rtrim, repeat()

New in version 1.12.0.

repeat(n: Union[int, Expression[int]]) → pyflink.table.expression.Expression[str][source]¶: Returns a string that repeats the base string n times.

See also

trim_leading(), trim_trailing(), trim(), replace(), char_length, upper_case, lower_case, init_cap, like(), similar(), position(), lpad(), rpad(), overlay(), regexp_replace(), regexp_extract(), substring(), from_base64, to_base64, ltrim, rtrim, repeat()

New in version 1.12.0.

replace(search: Union[str, Expression[str]] = None, replacement: Union[str, Expression[str]] = None) → pyflink.table.expression.Expression[str][source]¶

Returns a new string which replaces all the occurrences of the search target with the replacement string (non-overlapping).

e.g. lit(‘This is a test String.’).replace(’ ‘, ‘_’) leads to This_is_a_test_String.

New in version 1.12.0.

property reverse¶: Reverse each character in current string.

New in version 1.12.0.

right(length: Union[int, Expression[int]]) → pyflink.table.expression.Expression[str][source]¶: Returns the rightmost integer characters from the input string.

New in version 1.12.0.

round(places: Union[int, Expression[int]])[source]¶

Rounds the given number to integer places right to the decimal point.

e.g. lit(646.646).round(2) leads to 646.65, lit(646.646).round(3) leads to 646.646, lit(646.646).round(0) leads to 647, lit(646.646).round(-2) leads to 600.

New in version 1.12.0.

property rowtime¶: Declares a field as the rowtime attribute for indicating, accessing, and working in Flink’s event time.

See also

rowtime

New in version 1.12.0.

rpad(length: Union[int, Expression[int]], pad: Union[str, Expression[str]]) → pyflink.table.expression.Expression[str][source]¶: Returns a string right-padded with the given pad string to a length of len characters. If the string is longer than len, the return value is shortened to len characters. e.g. lit(‘hi’).rpad(4, ‘??’) returns ‘hi??’, lit(‘hi’).rpad(1, ‘??’) returns ‘h’

See also

trim_leading(), trim_trailing(), trim(), replace(), char_length, upper_case, lower_case, init_cap, like(), similar(), position(), lpad(), rpad(), overlay(), regexp_replace(), regexp_extract(), substring(), from_base64, to_base64, ltrim, rtrim, repeat()

New in version 1.12.0.

property rtrim¶: Returns a string that removes the right whitespaces from the given string.

See also

trim_leading(), trim_trailing(), trim(), replace(), char_length, upper_case, lower_case, init_cap, like(), similar(), position(), lpad(), rpad(), overlay(), regexp_replace(), regexp_extract(), substring(), from_base64, to_base64, ltrim, rtrim, repeat()

New in version 1.12.0.

property second¶

Creates an interval of the given number of seconds.

The produced expression is of type INTERVAL().

New in version 1.12.0.

property seconds¶

Creates an interval of the given number of seconds.

The produced expression is of type INTERVAL().

New in version 1.12.0.

property sha1¶

Returns the SHA-1 hash of the string argument; null if string is null.

Returns: string of 40 hexadecimal digits or null.

New in version 1.12.0.

sha2(hash_length: Union[int, Expression[int]]) → pyflink.table.expression.Expression[str][source]¶

Returns the hash for the given string expression using the SHA-2 family of hash functions (SHA-224, SHA-256, SHA-384, or SHA-512).

Parameters: hash_length – bit length of the result (either 224, 256, 384, or 512)
Returns: string or null if one of the arguments is null.

New in version 1.12.0.

property sha224¶

Returns the SHA-224 hash of the string argument; null if string is null.

Returns: string of 56 hexadecimal digits or null.

New in version 1.12.0.

property sha256¶

Returns the SHA-256 hash of the string argument; null if string is null.

Returns: string of 64 hexadecimal digits or null.

New in version 1.12.0.

property sha384¶

Returns the SHA-384 hash of the string argument; null if string is null.

Returns: string of 96 hexadecimal digits or null.

New in version 1.12.0.

property sha512¶

Returns the SHA-512 hash of the string argument; null if string is null.

Returns: string of 128 hexadecimal digits or null.

New in version 1.12.0.

property sign¶

Calculates the signum of a given number.

e.g. lit(1.23).sign leads to 1.00, lit(-1.23).sign leads to -1.00.

New in version 1.12.0.

similar(pattern: Union[str, Expression[str]] = None) → pyflink.table.expression.Expression[bool][source]¶: Returns true, if a string matches the specified SQL regex pattern. e.g. ‘A+’ matches all strings that consist of at least one A

See also

trim_leading(), trim_trailing(), trim(), replace(), char_length, upper_case, lower_case, init_cap, like(), similar(), position(), lpad(), rpad(), overlay(), regexp_replace(), regexp_extract(), substring(), from_base64, to_base64, ltrim, rtrim, repeat()

New in version 1.12.0.

property sin¶: Calculates the sine of a given number.

See also

sin, cos, sinh, cosh, tan, cot, asin, acos, atan, tanh

New in version 1.12.0.

property sinh¶: Calculates the hyperbolic sine of a given number.

See also

sin, cos, sinh, cosh, tan, cot, asin, acos, atan, tanh

New in version 1.12.0.

split_index(separator: Union[str, Expression[str]], index: Union[int, Expression[int]]) → pyflink.table.expression.Expression[str][source]¶: Split target string with custom separator and pick the index-th(start with 0) result.

New in version 1.12.0.

property sqrt¶: Calculates the square root of a given value.

New in version 1.12.0.

property start¶

Returns the start time (inclusive) of a window when applied on a window reference.

Example:

>>> tab.window(Tumble
>>>         .over(row_interval(2))
>>>         .on(col("a"))
>>>         .alias("w")) \
>>>     .group_by(col("c"), col("w")) \
>>>     .select(col("c"), col("w").start, col("w").end, col("w").proctime)

See also

end

New in version 1.12.0.

property stddev_pop¶

Returns the population standard deviation of an expression(the square root of var_pop).

Example:

>>> tab \
>>>     .group_by(col("a")) \
>>>     .select(col("a"),
>>>             col("b").sum.alias("d"),
>>>             col("b").sum0.alias("e"),
>>>             col("b").min.alias("f"),
>>>             col("b").max.alias("g"),
>>>             col("b").count.alias("h"),
>>>             col("b").avg.alias("i"),
>>>             col("b").stddev_pop.alias("j"),
>>>             col("b").stddev_samp.alias("k"),
>>>             col("b").var_pop.alias("l"),
>>>             col("b").var_samp.alias("m"),
>>>             col("b").collect.alias("n"))

New in version 1.12.0.

property stddev_samp¶

Returns the sample standard deviation of an expression(the square root of var_samp).

Example:

>>> tab \
>>>     .group_by(col("a")) \
>>>     .select(col("a"),
>>>             col("b").sum.alias("d"),
>>>             col("b").sum0.alias("e"),
>>>             col("b").min.alias("f"),
>>>             col("b").max.alias("g"),
>>>             col("b").count.alias("h"),
>>>             col("b").avg.alias("i"),
>>>             col("b").stddev_pop.alias("j"),
>>>             col("b").stddev_samp.alias("k"),
>>>             col("b").var_pop.alias("l"),
>>>             col("b").var_samp.alias("m"),
>>>             col("b").collect.alias("n"))

New in version 1.12.0.

str_to_map(list_delimiter: Union[str, Expression[str]] = None, key_value_delimiter: Union[str, Expression[str]] = None) → pyflink.table.expression.Expression[dict][source]¶: Creates a map by parsing text. Split text into key-value pairs using two delimiters. The first delimiter separates pairs, and the second delimiter separates key and value. Both list_delimiter and key_value_delimiter are treated as regular expressions. Default delimiters are used: ‘,’ as list_delimiter and ‘=’ as key_value_delimiter.

New in version 1.12.0.

substr(begin_index: Union[int, Expression[int]], length: Union[int, Expression[int]] = None) → pyflink.table.expression.Expression[str][source]¶

Creates a substring of the given string at given index for a given length.

Parameters

begin_index – first character of the substring (starting at 1, inclusive)
length – number of characters of the substring

New in version 1.12.0.

substring(begin_index: Union[int, Expression[int]], length: Union[int, Expression[int]] = None) → pyflink.table.expression.Expression[str][source]¶

Creates a substring of the given string at given index for a given length.

Parameters

begin_index – first character of the substring (starting at 1, inclusive)
length – number of characters of the substring

New in version 1.12.0.

property sum¶

Returns the sum of the numeric field across all input values. If all values are null, null is returned.

Example:

>>> tab \
>>>     .group_by(col("a")) \
>>>     .select(col("a"),
>>>             col("b").sum.alias("d"),
>>>             col("b").sum0.alias("e"),
>>>             col("b").min.alias("f"),
>>>             col("b").max.alias("g"),
>>>             col("b").count.alias("h"),
>>>             col("b").avg.alias("i"),
>>>             col("b").stddev_pop.alias("j"),
>>>             col("b").stddev_samp.alias("k"),
>>>             col("b").var_pop.alias("l"),
>>>             col("b").var_samp.alias("m"),
>>>             col("b").collect.alias("n"))

New in version 1.12.0.

property sum0¶

Returns the sum of the numeric field across all input values. If all values are null, 0 is returned.

Example:

>>> tab \
>>>     .group_by(col("a")) \
>>>     .select(col("a"),
>>>             col("b").sum.alias("d"),
>>>             col("b").sum0.alias("e"),
>>>             col("b").min.alias("f"),
>>>             col("b").max.alias("g"),
>>>             col("b").count.alias("h"),
>>>             col("b").avg.alias("i"),
>>>             col("b").stddev_pop.alias("j"),
>>>             col("b").stddev_samp.alias("k"),
>>>             col("b").var_pop.alias("l"),
>>>             col("b").var_samp.alias("m"),
>>>             col("b").collect.alias("n"))

New in version 1.12.0.

property tan¶: Calculates the tangent of a given number.

See also

sin, cos, sinh, cosh, tan, cot, asin, acos, atan, tanh

New in version 1.12.0.

property tanh¶: Calculates the hyperbolic tangent of a given number.

See also

sin, cos, sinh, cosh, tan, cot, asin, acos, atan, tanh

New in version 1.12.0.

then(if_true, if_false) → pyflink.table.expression.Expression[source]¶

Ternary conditional operator that decides which of two other expressions should be evaluated based on a evaluated boolean condition.

e.g. lit(42).is_greater(5).then(“A”, “B”) leads to “A”

Parameters

if_true – expression to be evaluated if condition holds
if_false – expression to be evaluated if condition does not hold

New in version 1.12.0.

property to_base64¶: Returns the base64-encoded result of the input string.

See also

trim_leading(), trim_trailing(), trim(), replace(), char_length, upper_case, lower_case, init_cap, like(), similar(), position(), lpad(), rpad(), overlay(), regexp_replace(), regexp_extract(), substring(), from_base64, to_base64, ltrim, rtrim, repeat()

New in version 1.12.0.

property to_date¶

Parses a date string in the form “yyyy-MM-dd” to a SQL Date. It’s equivalent to col.cast(DataTypes.DATE()).

Example:

>>> lit("2016-06-15").to_date

New in version 1.12.0.

property to_time¶

Parses a time string in the form “HH:mm:ss” to a SQL Time. It’s equivalent to col.cast(DataTypes.TIME()).

Example:

>>> lit("3:30:00").to_time

New in version 1.12.0.

property to_timestamp¶

Parses a timestamp string in the form “yyyy-MM-dd HH:mm:ss[.SSS]” to a SQL Timestamp. It’s equivalent to col.cast(DataTypes.TIMESTAMP(3)).

Example:

>>> lit('2016-06-15 3:30:00.001').to_timestamp

New in version 1.12.0.

trim(character: Union[str, Expression[str]] = None) → pyflink.table.expression.Expression[str][source]¶: Removes leading and trailing space characters from the given string if character is None. Otherwise, removes leading and trailing specified characters from the given string.

See also

trim_leading(), trim_trailing(), trim(), replace(), char_length, upper_case, lower_case, init_cap, like(), similar(), position(), lpad(), rpad(), overlay(), regexp_replace(), regexp_extract(), substring(), from_base64, to_base64, ltrim, rtrim, repeat()

New in version 1.12.0.

trim_leading(character: Union[str, Expression[str]] = None) → pyflink.table.expression.Expression[str][source]¶: Removes leading space characters from the given string if character is None. Otherwise, removes leading specified characters from the given string.

See also

trim_leading(), trim_trailing(), trim(), replace(), char_length, upper_case, lower_case, init_cap, like(), similar(), position(), lpad(), rpad(), overlay(), regexp_replace(), regexp_extract(), substring(), from_base64, to_base64, ltrim, rtrim, repeat()

New in version 1.12.0.

trim_trailing(character: Union[str, Expression[str]] = None) → pyflink.table.expression.Expression[str][source]¶: Removes trailing space characters from the given string if character is None. Otherwise, removes trailing specified characters from the given string.

See also

trim_leading(), trim_trailing(), trim(), replace(), char_length, upper_case, lower_case, init_cap, like(), similar(), position(), lpad(), rpad(), overlay(), regexp_replace(), regexp_extract(), substring(), from_base64, to_base64, ltrim, rtrim, repeat()

New in version 1.12.0.

truncate(n: Union[int, Expression[int]] = 0) → pyflink.table.expression.Expression[T][source]¶: Returns a number of truncated to n decimal places. If n is 0, the result has no decimal point or fractional part. n can be negative to cause n digits left of the decimal point of the value to become zero. E.g. truncate(42.345, 2) to 42.34, 42.truncate(-1) to 40

New in version 1.12.0.

try_cast(data_type: pyflink.table.types.DataType) → pyflink.table.expression.Expression[source]¶

Like cast, but in case of error, returns NULL rather than failing the job.

E.g. lit(“42”).try_cast(DataTypes.INT()) returns 42; lit(null).try_cast(DataTypes.STRING()) returns NULL of type STRING; lit(“non-number”).cast(DataTypes.INT()) returns NULL of type INT. coalesce(lit(“non-number”).cast(DataTypes.INT()), lit(0)) returns 0 of type INT.

New in version 1.12.0.

property upper_case¶: Returns all of the characters in a string in upper case using the rules of the default locale.

See also

trim_leading(), trim_trailing(), trim(), replace(), char_length, upper_case, lower_case, init_cap, like(), similar(), position(), lpad(), rpad(), overlay(), regexp_replace(), regexp_extract(), substring(), from_base64, to_base64, ltrim, rtrim, repeat()

New in version 1.12.0.

property var_pop¶

Returns the population standard variance of an expression.

Example:

>>> tab \
>>>     .group_by(col("a")) \
>>>     .select(col("a"),
>>>             col("b").sum.alias("d"),
>>>             col("b").sum0.alias("e"),
>>>             col("b").min.alias("f"),
>>>             col("b").max.alias("g"),
>>>             col("b").count.alias("h"),
>>>             col("b").avg.alias("i"),
>>>             col("b").stddev_pop.alias("j"),
>>>             col("b").stddev_samp.alias("k"),
>>>             col("b").var_pop.alias("l"),
>>>             col("b").var_samp.alias("m"),
>>>             col("b").collect.alias("n"))

New in version 1.12.0.

property var_samp¶

Returns the sample variance of a given expression.

Example:

>>> tab \
>>>     .group_by(col("a")) \
>>>     .select(col("a"),
>>>             col("b").sum.alias("d"),
>>>             col("b").sum0.alias("e"),
>>>             col("b").min.alias("f"),
>>>             col("b").max.alias("g"),
>>>             col("b").count.alias("h"),
>>>             col("b").avg.alias("i"),
>>>             col("b").stddev_pop.alias("j"),
>>>             col("b").stddev_samp.alias("k"),
>>>             col("b").var_pop.alias("l"),
>>>             col("b").var_samp.alias("m"),
>>>             col("b").collect.alias("n"))

New in version 1.12.0.

property week¶

Creates an interval of the given number of weeks.

The produced expression is of type INTERVAL().

New in version 1.12.0.

property weeks¶

Creates an interval of the given number of weeks.

The produced expression is of type INTERVAL().

New in version 1.12.0.

property year¶

Creates an interval of the given number of years.

The produced expression is of type INTERVAL().

New in version 1.12.0.

property years¶

Creates an interval of the given number of years.

The produced expression is of type INTERVAL().

New in version 1.12.0.

class pyflink.table.FormatDescriptor(j_format_descriptor)[source]¶

Bases: object

Describes a Format and its options for use with TableDescriptor.

Formats are responsible for encoding and decoding data in table connectors. Note that not every connector has a format, while others may have multiple formats (e.g. the Kafka connector has separate formats for keys and values). Common formats are “json”, “csv”, “avro”, etc.

class Builder(j_builder)[source]¶

Bases: object

Builder for FormatDescriptor.

build() → pyflink.table.table_descriptor.FormatDescriptor[source]¶: Returns an immutable instance of FormatDescriptor.

option(key: Union[str, pyflink.common.config_options.ConfigOption], value) → pyflink.table.table_descriptor.FormatDescriptor.Builder[source]¶

Sets the given option on the format.

Note that format options must not be prefixed with the format identifier itself here.

Example:

>>> FormatDescriptor.for_format("json")                 ...     .option("ignore-parse-errors", "true")                 ...     .build()

will automatically be converted into its prefixed form:

    'format' = 'json'
    'json.ignore-parse-errors' = 'true'

static for_format(format: str) → pyflink.table.table_descriptor.FormatDescriptor.Builder[source]¶

Creates a new Builder describing a format with the given format identifier.

Parameters: format – The factory identifier for the format.

get_format() → str[source]¶

get_options() → Dict[str, str][source]¶

class pyflink.table.FunctionContext(base_metric_group)[source]¶

Bases: object

Used to obtain global runtime information about the context in which the user-defined function is executed. The information includes the metric group, and global job parameters, etc.

get_metric_group() → pyflink.metrics.metricbase.MetricGroup[source]¶: Returns the metric group for this parallel subtask.

New in version 1.11.0.

class pyflink.table.GroupWindowedTable(java_group_windowed_table, t_env)[source]¶

Bases: object

A table that has been windowed for GroupWindow.

group_by(*fields: pyflink.table.expression.Expression) → pyflink.table.table.WindowGroupedTable[source]¶

Groups the elements by a mandatory window and one or more optional grouping attributes. The window is specified by referring to its alias.

If no additional grouping attribute is specified and if the input is a streaming table, the aggregation will be performed by a single task, i.e., with parallelism 1.

Aggregations are performed per group and defined by a subsequent select() clause similar to SQL SELECT-GROUP-BY query.

Example:

>>> from pyflink.table.expressions import col, lit
>>> tab.window(Tumble.over(lit(10).minutes).on(col('rowtime')).alias('w')) \
...     .group_by(col('w')) \
...     .select(col('a').sum.alias('a'),
...             col('w').start.alias('b'),
...             col('w').end.alias('c'),
...             col('w').rowtime.alias('d'))

Parameters: fields – Group keys.
Returns: A window grouped table.

class pyflink.table.GroupedTable(java_table, t_env)[source]¶

Bases: object

A table that has been grouped on a set of grouping keys.

aggregate(func: Union[pyflink.table.expression.Expression, pyflink.table.udf.UserDefinedAggregateFunctionWrapper]) → pyflink.table.table.AggregatedTable[source]¶

Performs a aggregate operation with an aggregate function. You have to close the aggregate with a select statement.

Example:

>>> agg = udaf(lambda a: (a.mean(), a.max()),
...               result_type=DataTypes.ROW(
...                   [DataTypes.FIELD("a", DataTypes.FLOAT()),
...                    DataTypes.FIELD("b", DataTypes.INT())]),
...               func_type="pandas")
>>> tab.group_by(col('a')).aggregate(agg(col('b')).alias("c", "d")).select(
...     col('a'), col('c'), col('d'))
>>> # take all the columns as inputs
>>> # pd is a Pandas.DataFrame
>>> agg_row = udaf(lambda pd: (pd.a.mean(), pd.b.max()),
...               result_type=DataTypes.ROW(
...                   [DataTypes.FIELD("a", DataTypes.FLOAT()),
...                    DataTypes.FIELD("b", DataTypes.INT())]),
...               func_type="pandas")
>>> tab.group_by(col('a')).aggregate(agg.alias("a", "b")).select(col('a'), col('b'))

Parameters: func – user-defined aggregate function.
Returns: The result table.

New in version 1.13.0.

flat_aggregate(func: Union[pyflink.table.expression.Expression, pyflink.table.udf.UserDefinedAggregateFunctionWrapper]) → pyflink.table.table.FlatAggregateTable[source]¶

Performs a flat_aggregate operation on a grouped table. flat_aggregate takes a TableAggregateFunction which returns multiple rows. Use a selection after flatAggregate.

Example:

>>> table_agg = udtaf(MyTableAggregateFunction())
>>> tab.group_by(col('c')).flat_aggregate(table_agg(col('a')).alias("a")).select(
...     col('c'), col('a'))
>>> # take all the columns as inputs
>>> class Top2(TableAggregateFunction):
...     def emit_value(self, accumulator):
...         yield Row(accumulator[0])
...         yield Row(accumulator[1])
...
...     def create_accumulator(self):
...         return [None, None]
...
...     def accumulate(self, accumulator, *args):
...         args[0] # type: Row
...         if args[0][0] is not None:
...             if accumulator[0] is None or args[0][0] > accumulator[0]:
...                 accumulator[1] = accumulator[0]
...                 accumulator[0] = args[0][0]
...             elif accumulator[1] is None or args[0][0] > accumulator[1]:
...                 accumulator[1] = args[0][0]
...
...     def get_accumulator_type(self):
...         return DataTypes.ARRAY(DataTypes.BIGINT())
...
...     def get_result_type(self):
...         return DataTypes.ROW(
...             [DataTypes.FIELD("a", DataTypes.BIGINT())])
>>> top2 = udtaf(Top2())
>>> tab.group_by(col('c')) \
...    .flat_aggregate(top2.alias("a", "b")) \
...    .select(col('a'), col('b'))

Parameters: func – user-defined table aggregate function.
Returns: The result table.

New in version 1.13.0.

select(*fields: pyflink.table.expression.Expression) → pyflink.table.table.Table[source]¶

Performs a selection operation on a grouped table. Similar to an SQL SELECT statement. The field expressions can contain complex expressions and aggregations.

Example:

>>> tab.group_by(col('key')).select(col('key'), col('value').avg.alias('average'))

Parameters: fields – Expression string that contains group keys and aggregate function calls.
Returns: The result table.

class pyflink.table.ListView(*args, **kwds)[source]¶

Bases: pyflink.table.data_view.DataView, typing.Generic

A DataView that provides list-like functionality in the accumulator of an AggregateFunction when large amounts of data are expected.

add(value: T) → None[source]¶: Adds the given value to this list view.

add_all(values: List[T]) → None[source]¶: Adds all of the elements of the specified list to this list view.

clear() → None[source]¶: Clears the DataView and removes all data.

get() → Iterable[T][source]¶: Returns an iterable of this list view.

class pyflink.table.MapView(*args, **kwds)[source]¶

Bases: typing.Generic

A DataView that provides dict-like functionality in the accumulator of an AggregateFunction when large amounts of data are expected.

clear() → None[source]¶: Removes all entries of this map.

contains(key: K) → bool[source]¶: Checks if the map view contains a value for a given key.

get(key: K) → V[source]¶: Return the value for the specified key.

is_empty() → bool[source]¶: Returns true if the map view contains no key-value mappings, otherwise false.

items() → Iterable[Tuple[K, V]][source]¶: Returns all entries of the map view.

keys() → Iterable[K][source]¶: Returns all the keys in the map view.

put(key: K, value: V) → None[source]¶: Inserts a value for the given key into the map view. If the map view already contains a value for the key, the existing value is overwritten.

put_all(dict_value: Dict[K, V]) → None[source]¶: Inserts all mappings from the specified map to this map view.

remove(key: K) → None[source]¶: Deletes the value for the given key.

values() → Iterable[V][source]¶: Returns all the values in the map view.

class pyflink.table.Module(j_module)[source]¶

Bases: object

Modules define a set of metadata, including functions, user defined types, operators, rules, etc. Metadata from modules are regarded as built-in or system metadata that users can take advantages of.

New in version 1.12.0.

class pyflink.table.ModuleEntry(name: str, used: bool, j_module_entry=None)[source]¶

Bases: object

A POJO to represent a module’s name and use status.

name() → str[source]¶

used() → bool[source]¶

class pyflink.table.OverWindowedTable(java_over_windowed_table, t_env)[source]¶

Bases: object

A table that has been windowed for OverWindow.

Unlike group windows, which are specified in the GROUP BY clause, over windows do not collapse rows. Instead over window aggregates compute an aggregate for each input row over a range of its neighboring rows.

select(*fields: pyflink.table.expression.Expression) → pyflink.table.table.Table[source]¶

Performs a selection operation on a over windowed table. Similar to an SQL SELECT statement. The field expressions can contain complex expressions and aggregations.

Example:

>>> over_windowed_table.select(col('c'),
...                            col('b').count.over(col('ow')),
...                            col('e').sum.over(col('ow')))

Parameters: fields – Expression string.
Returns: The result table.

class pyflink.table.ResultKind[source]¶

Bases: object

ResultKind defines the types of the result.

SUCCESS:

The statement (e.g. DDL, USE) executes successfully, and the result only contains a simple “OK”.

SUCCESS_WITH_CONTENT:

The statement (e.g. DML, DQL, SHOW) executes successfully, and the result contains important content.

New in version 1.11.0.

SUCCESS = 0¶

SUCCESS_WITH_CONTENT = 1¶

class pyflink.table.Row(*args, **kwargs)[source]¶

Bases: object

A row in Table. The fields in it can be accessed:

like attributes (row.key)
like dictionary values (row[key])

key in row will search through row keys.

Row can be used to create a row object by using named arguments, the fields will be sorted by names. It is not allowed to omit a named argument to represent the value is None or missing. This should be explicitly set to None in this case.

>>> row = Row(name="Alice", age=11)
>>> row
Row(age=11, name='Alice')
>>> row['name'], row['age']
('Alice', 11)
>>> row.name, row.age
('Alice', 11)
>>> 'name' in row
True
>>> 'wrong_key' in row
False

Row can also be used to create another Row like class, then it could be used to create Row objects, such as

>>> Person = Row("name", "age")
>>> Person
<Row(name, age)>
>>> 'name' in Person
True
>>> 'wrong_key' in Person
False
>>> Person("Alice", 11)
Row(name='Alice', age=11)

as_dict(recursive=False)[source]¶

Returns as a dict.

Example:

>>> Row(name="Alice", age=11).as_dict() == {'name': 'Alice', 'age': 11}
True
>>> row = Row(key=1, value=Row(name='a', age=2))
>>> row.as_dict() == {'key': 1, 'value': Row(age=2, name='a')}
True
>>> row.as_dict(True) == {'key': 1, 'value': {'name': 'a', 'age': 2}}
True

Parameters: recursive – turns the nested Row as dict (default: False).

get_fields_by_names(names: List[str])[source]¶

get_row_kind() → pyflink.common.types.RowKind[source]¶

static of_kind(row_kind: pyflink.common.types.RowKind, *args, **kwargs)[source]¶

set_field_names(field_names: List)[source]¶

set_row_kind(row_kind: pyflink.common.types.RowKind)[source]¶

class pyflink.table.RowKind(value)[source]¶

Bases: enum.Enum

An enumeration.

DELETE = 3¶

INSERT = 0¶

UPDATE_AFTER = 2¶

UPDATE_BEFORE = 1¶

to_j_row_kind()[source]¶

class pyflink.table.ScalarFunction[source]¶

Bases: pyflink.table.udf.UserDefinedFunction

Base interface for user-defined scalar function. A user-defined scalar functions maps zero, one, or multiple scalar values to a new scalar value.

New in version 1.10.0.

abstract eval(*args)[source]¶: Method which defines the logic of the scalar function.

class pyflink.table.Schema(j_schema)[source]¶

Bases: object

Schema of a table or view.

A schema represents the schema part of a {@code CREATE TABLE (schema) WITH (options)} DDL statement in SQL. It defines columns of different kind, constraints, time attributes, and watermark strategies. It is possible to reference objects (such as functions or types) across different catalogs.

This class is used in the API and catalogs to define an unresolved schema that will be translated to ResolvedSchema. Some methods of this class perform basic validation, however, the main validation happens during the resolution. Thus, an unresolved schema can be incomplete and might be enriched or merged with a different schema at a later stage.

Since an instance of this class is unresolved, it should not be directly persisted. The str() shows only a summary of the contained objects.

class Builder(j_builder)[source]¶

Bases: object

A builder for constructing an immutable but still unresolved Schema.

build() → pyflink.table.schema.Schema[source]¶: Returns an instance of an unresolved Schema.

column(column_name: str, data_type: Union[str, pyflink.table.types.DataType]) → pyflink.table.schema.Schema.Builder[source]¶

Declares a physical column that is appended to this schema.

Physical columns are regular columns known from databases. They define the names, the types, and the order of fields in the physical data. Thus, physical columns represent the payload that is read from and written to an external system. Connectors and formats use these columns (in the defined order) to configure themselves. Other kinds of columns can be declared between physical columns but will not influence the final physical schema.

Parameters

column_name – Column name
data_type – Data type of the column

column_by_expression(column_name: str, expr: Union[str, pyflink.table.expression.Expression]) → pyflink.table.schema.Schema.Builder[source]¶

Declares a computed column that is appended to this schema.

Computed columns are virtual columns that are generated by evaluating an expression that can reference other columns declared in the same table. Both physical columns and metadata columns can be accessed. The column itself is not physically stored within the table. The column’s data type is derived automatically from the given expression and does not have to be declared manually.

Computed columns are commonly used for defining time attributes. For example, the computed column can be used if the original field is not TIMESTAMP(3) type or is nested in a JSON string.

Example:

>>> Schema.new_builder() \
...     .column_by_expression("ts", "orig_ts - INTERVAL '60' MINUTE") \
...     .column_by_metadata("orig_ts", DataTypes.TIMESTAMP(3), "timestamp")

Parameters

column_name – Column name
expr – Computation of the column

column_by_metadata(column_name: str, data_type: Union[pyflink.table.types.DataType, str], metadata_key: str = None, is_virtual: bool = False) → pyflink.table.schema.Schema.Builder[source]¶

Declares a metadata column that is appended to this schema.

Metadata columns allow to access connector and/or format specific fields for every row of a table. For example, a metadata column can be used to read and write the timestamp from and to Kafka records for time-based operations. The connector and format documentation lists the available metadata fields for every component.

Every metadata field is identified by a string-based key and has a documented data type. The metadata key can be omitted if the column name should be used as the identifying metadata key. For convenience, the runtime will perform an explicit cast if the data type of the column differs from the data type of the metadata field. Of course, this requires that the two data types are compatible.

By default, a metadata column can be used for both reading and writing. However, in many cases an external system provides more read-only metadata fields than writable fields. Therefore, it is possible to exclude metadata columns from persisting by setting the {@code is_virtual} flag to {@code true}.

Parameters

column_name – Column name
data_type – Data type of the column
metadata_key – Identifying metadata key, if null the column name will be used as metadata key
is_virtual – Whether the column should be persisted or not

from_fields(field_names: List[str], field_data_types: List[pyflink.table.types.DataType]) → pyflink.table.schema.Schema.Builder[source]¶: Adopts the given field names and field data types as physical columns of the schema.

from_row_data_type(data_type: pyflink.table.types.DataType) → pyflink.table.schema.Schema.Builder[source]¶: Adopts all fields of the given row as physical columns of the schema.

from_schema(unresolved_schema: pyflink.table.schema.Schema) → pyflink.table.schema.Schema.Builder[source]¶: Adopts all members from the given unresolved schema.

primary_key(*column_names: str) → pyflink.table.schema.Schema.Builder[source]¶

Declares a primary key constraint for a set of given columns. Primary key uniquely identify a row in a table. Neither of columns in a primary can be nullable. The primary key is informational only. It will not be enforced. It can be used for optimizations. It is the data owner’s responsibility to ensure uniqueness of the data.

The primary key will be assigned a generated name in the format {@code PK_col1_col2}.

Parameters: column_names – Columns that form a unique primary key

primary_key_named(constraint_name: str, *column_names: str) → pyflink.table.schema.Schema.Builder[source]¶

Declares a primary key constraint for a set of given columns. Primary key uniquely identify a row in a table. Neither of columns in a primary can be nullable. The primary key is informational only. It will not be enforced. It can be used for optimizations. It is the data owner’s responsibility to ensure uniqueness of the data.

Parameters

constraint_name – Name for the primary key, can be used to reference the constraint
column_names – Columns that form a unique primary key

watermark(column_name: str, watermark_expr: Union[str, pyflink.table.expression.Expression]) → pyflink.table.schema.Schema.Builder[source]¶

Declares that the given column should serve as an event-time (i.e. rowtime) attribute and specifies a corresponding watermark strategy as an expression.

The column must be of type {@code TIMESTAMP(3)} or {@code TIMESTAMP_LTZ(3)} and be a top-level column in the schema. It may be a computed column.

The watermark generation expression is evaluated by the framework for every record during runtime. The framework will periodically emit the largest generated watermark. If the current watermark is still identical to the previous one, or is null, or the value of the returned watermark is smaller than that of the last emitted one, then no new watermark will be emitted. A watermark is emitted in an interval defined by the configuration.

Any scalar expression can be used for declaring a watermark strategy for in-memory/temporary tables. However, currently, only SQL expressions can be persisted in a catalog. The expression’s return data type must be {@code TIMESTAMP(3)}. User-defined functions (also defined in different catalogs) are supported.

Example:

>>> Schema.new_builder().watermark("ts", "ts - INTERVAL '5' SECOND")

Parameters

column_name – The column name used as a rowtime attribute
watermark_expr – The expression used for watermark generation

static new_builder() → pyflink.table.schema.Schema.Builder[source]¶

class pyflink.table.SqlDialect[source]¶

Bases: object

Enumeration of valid SQL compatibility modes.

In most of the cases, the built-in compatibility mode should be sufficient. For some features, i.e. the “INSERT INTO T PARTITION(a=’xxx’) …” grammar, you may need to switch to the Hive dialect if required.

We may introduce other SQL dialects in the future.

DEFAULT:

Flink’s default SQL behavior.

HIVE:

SQL dialect that allows some Apache Hive specific grammar.

Note: We might never support all of the Hive grammar. See the documentation for supported features.

DEFAULT = 0¶

HIVE = 1¶

class pyflink.table.StatementSet(_j_statement_set, t_env)[source]¶

Bases: object

A StatementSet accepts pipelines defined by DML statements or Table objects. The planner can optimize all added statements together and then submit them as one job.

The added statements will be cleared when calling the execute() method.

New in version 1.11.0.

add_insert(target_path_or_descriptor: Union[str, pyflink.table.table_descriptor.TableDescriptor], table, overwrite: bool = False) → pyflink.table.statement_set.StatementSet[source]¶

Adds a statement that the pipeline defined by the given Table object should be written to a table (backed by a DynamicTableSink) that was registered under the specified path or expressed via the given TableDescriptor.

When target_path_or_descriptor is a tale path:

See the documentation of use_database() or use_catalog() for the rules on the path resolution.
When target_path_or_descriptor is a table descriptor:
The given TableDescriptor is registered as an inline (i.e. anonymous) temporary catalog table (see create_temporary_table()).

Then a statement is added to the statement set that inserts the Table object’s pipeline into that temporary table.

This method allows to declare a Schema for the sink descriptor. The declaration is similar to a {@code CREATE TABLE} DDL in SQL and allows to:
overwrite automatically derived columns with a custom DataType

add metadata columns next to the physical columns

declare a primary key
It is possible to declare a schema without physical/regular columns. In this case, those columns will be automatically derived and implicitly put at the beginning of the schema declaration.

Examples:
>>> stmt_set = table_env.create_statement_set() >>> source_table = table_env.from_path("SourceTable") >>> sink_descriptor = TableDescriptor.for_connector("blackhole") \ ... .schema(Schema.new_builder() ... .build()) \ ... .build() >>> stmt_set.add_insert(sink_descriptor, source_table)
Note

add_insert for a table descriptor (case 2.) was added from flink 1.14.0.

Parameters

target_path_or_descriptor – The path of the registered TableSink or the descriptor describing the sink table into which data should be inserted to which the Table is written.
table (pyflink.table.Table) – The Table to add.
overwrite – Indicates whether the insert should overwrite existing data or not.

Returns

current StatementSet instance.

New in version 1.11.0.

add_insert_sql(stmt: str) → pyflink.table.statement_set.StatementSet[source]¶

add insert statement to the set.

Parameters: stmt – The statement to be added.
Returns: current StatementSet instance.

New in version 1.11.0.

attach_as_datastream()[source]¶

Optimizes all statements as one entity and adds them as transformations to the underlying StreamExecutionEnvironment.

Use execute() to execute them.

The added statements will be cleared after calling this method.

New in version 1.16.0.

execute() → pyflink.table.table_result.TableResult[source]¶

execute all statements and Tables as a batch.

Note

The added statements and Tables will be cleared when executing this method.

Returns: execution result.

New in version 1.11.0.

explain(*extra_details: pyflink.table.explain_detail.ExplainDetail) → str[source]¶

returns the AST and the execution plan of all statements and Tables.

Parameters: extra_details – The extra explain details which the explain result should include, e.g. estimated cost, changelog mode for streaming
Returns: All statements and Tables for which the AST and execution plan will be returned.

New in version 1.11.0.

class pyflink.table.StreamTableEnvironment(j_tenv)[source]¶

Bases: pyflink.table.table_environment.TableEnvironment

static create(stream_execution_environment: pyflink.datastream.stream_execution_environment.StreamExecutionEnvironment = None, environment_settings: pyflink.table.environment_settings.EnvironmentSettings = None) → pyflink.table.table_environment.StreamTableEnvironment[source]¶

Creates a StreamTableEnvironment.

Example:

# create with StreamExecutionEnvironment.
>>> env = StreamExecutionEnvironment.get_execution_environment()
>>> table_env = StreamTableEnvironment.create(env)
# create with StreamExecutionEnvironment and EnvironmentSettings.
>>> configuration = Configuration()
>>> configuration.set_string('execution.buffer-timeout', '1 min')
>>> environment_settings = EnvironmentSettings \
...     .new_instance() \
...     .in_streaming_mode() \
...     .with_configuration(configuration) \
...     .build()
>>> table_env = StreamTableEnvironment.create(
...     env, environment_settings=environment_settings)
# create with EnvironmentSettings.
>>> table_env = StreamTableEnvironment.create(environment_settings=environment_settings)

Parameters

stream_execution_environment – The StreamExecutionEnvironment of the TableEnvironment.
environment_settings – The environment settings used to instantiate the TableEnvironment.

Returns

The StreamTableEnvironment created from given StreamExecutionEnvironment and configuration.

from_changelog_stream(data_stream: pyflink.datastream.data_stream.DataStream, schema: pyflink.table.schema.Schema = None, changelog_mode: pyflink.table.changelog_mode.ChangelogMode = None) → pyflink.table.table.Table[source]¶

Converts the given DataStream of changelog entries into a Table.

Compared to from_data_stream(), this method consumes instances of Row and evaluates the RowKind flag that is contained in every record during runtime. The runtime behavior is similar to that of a DynamicTableSource.

If you don’t specify the changelog_mode, the changelog containing all kinds of changes (enumerated in RowKind) as the default ChangelogMode.

Column names and types of the Table are automatically derived from the TypeInformation of the DataStream. If the outermost record’s TypeInformation is a CompositeType, it will be flattened in the first level. Composite nested fields will not be accessible.

By default, the stream record’s timestamp and watermarks are not propagated unless explicitly declared.

This method allows to declare a Schema for the resulting table. The declaration is similar to a {@code CREATE TABLE} DDL in SQL and allows to:

enrich or overwrite automatically derived columns with a custom DataType

reorder columns

add computed or metadata columns next to the physical columns

access a stream record’s timestamp

declare a watermark strategy or propagate the DataStream watermarks

declare a primary key

See from_data_stream() for more information and examples of how to declare a Schema.

Parameters

data_stream – The changelog stream of Row.
schema – The customized schema for the final table.
changelog_mode – The expected kinds of changes in the incoming changelog.

Returns

The converted Table.

from_data_stream(data_stream: pyflink.datastream.data_stream.DataStream, *fields_or_schema: Union[pyflink.table.expression.Expression, pyflink.table.schema.Schema]) → pyflink.table.table.Table[source]¶

When fields_or_schema is a sequence of Expression:
Converts the given DataStream into a Table with specified field names.

There are two modes for mapping original fields to the fields of the Table:
Reference input fields by name:

All fields in the schema definition are referenced by name (and possibly renamed using and alias (as). Moreover, we can define proctime and rowtime attributes at arbitrary positions using arbitrary names (except those that exist in the result schema). In this mode, fields can be reordered and projected out. This mode can be used for any input type.

Reference input fields by position:

In this mode, fields are simply renamed. Event-time attributes can replace the field on their position in the input data (if it is of correct type) or be appended at the end. Proctime attributes must be appended at the end. This mode can only be used if the input type has a defined field order (tuple, case class, Row) and none of the fields references a field of the input type.

When fields_or_schema is a Schema:

Converts the given DataStream into a Table.

Column names and types of the Table are automatically derived from the TypeInformation of the DataStream. If the outermost record’s TypeInformation is a CompositeType, it will be flattened in the first level. Composite nested fields will not be accessible.

Since the DataStream API does not support changelog processing natively, this method assumes append-only/insert-only semantics during the stream-to-table conversion. Records of class Row must describe RowKind.INSERT changes.

By default, the stream record’s timestamp and watermarks are not propagated unless explicitly declared.

This method allows to declare a Schema for the resulting table. The declaration is similar to a {@code CREATE TABLE} DDL in SQL and allows to:

enrich or overwrite automatically derived columns with a custom DataType

reorder columns

add computed or metadata columns next to the physical columns

access a stream record’s timestamp

declare a watermark strategy or propagate the DataStream watermarks

It is possible to declare a schema without physical/regular columns. In this case, those columns will be automatically derived and implicitly put at the beginning of the schema declaration.

The following examples illustrate common schema declarations and their semantics:

Example:
=== EXAMPLE 1 ===

no physical columns defined, they will be derived automatically,
e.g. BigDecimal becomes DECIMAL(38, 18)

>>> Schema.new_builder()                 ...     .column_by_expression("c1", "f1 + 42")                 ...     .column_by_expression("c2", "f1 - 1")                 ...     .build()

equal to: CREATE TABLE (f0 STRING, f1 DECIMAL(38, 18), c1 AS f1 + 42, c2 AS f1 - 1)

=== EXAMPLE 2 ===

physical columns defined, input fields and columns will be mapped by name,
columns are reordered and their data type overwritten,
all columns must be defined to show up in the final table's schema

>>> Schema.new_builder()                 ...     .column("f1", "DECIMAL(10, 2)")                 ...     .column_by_expression("c", "f1 - 1")                 ...     .column("f0", "STRING")                 ...     .build()

equal to: CREATE TABLE (f1 DECIMAL(10, 2), c AS f1 - 1, f0 STRING)

=== EXAMPLE 3 ===

timestamp and watermarks can be added from the DataStream API,
physical columns will be derived automatically

>>> Schema.new_builder()                 ...     .column_by_metadata("rowtime", "TIMESTAMP_LTZ(3)")                 ...     .watermark("rowtime", "SOURCE_WATERMARK()")                 ...     .build()

equal to:
    CREATE TABLE (
        f0 STRING,
        f1 DECIMAL(38, 18),
        rowtime TIMESTAMP(3) METADATA,
        WATERMARK FOR rowtime AS SOURCE_WATERMARK()
    )
Note

create_temporary_view by providing a Schema (case 2.) was added from flink 1.14.0.

Parameters

data_stream – The datastream to be converted.
fields_or_schema – The fields expressions to map original fields of the DataStream to the fields of the Table or the customized schema for the final table.

Returns

The converted Table.

New in version 1.12.0.

to_append_stream(table: pyflink.table.table.Table, type_info: pyflink.common.typeinfo.TypeInformation) → pyflink.datastream.data_stream.DataStream[source]¶

Converts the given Table into a DataStream of a specified type. The Table must only have insert (append) changes. If the Table is also modified by update or delete changes, the conversion will fail.

The fields of the Table are mapped to DataStream as follows: Row and Tuple types: Fields are mapped by position, field types must match.

Parameters

table – The Table to convert.
type_info – The TypeInformation that specifies the type of the DataStream.

Returns

The converted DataStream.

New in version 1.12.0.

to_changelog_stream(table: pyflink.table.table.Table, target_schema: pyflink.table.schema.Schema = None, changelog_mode: pyflink.table.changelog_mode.ChangelogMode = None) → pyflink.datastream.data_stream.DataStream[source]¶

Converts the given Table into a DataStream of changelog entries.

Compared to to_data_stream(), this method produces instances of Row and sets the RowKind flag that is contained in every record during runtime. The runtime behavior is similar to that of a DynamicTableSink.

If you don’t specify the changelog_mode, the changelog containing all kinds of changes (enumerated in RowKind) as the default ChangelogMode.

The given Schema is used to configure the table runtime to convert columns and internal data structures to the desired representation. The following example shows how to convert a table column into a Row type.

Example:

>>> table_env.to_changelog_stream(
...     table,
...     Schema.new_builder()             ...         .column("id", DataTypes.BIGINT())
...         .column("payload", DataTypes.ROW(
...                                     [DataTypes.FIELD("name", DataTypes.STRING()),
...                                      DataTypes.FIELD("age", DataTypes.INT())]))
...         .build())

Note that the type system of the table ecosystem is richer than the one of the DataStream API. The table runtime will make sure to properly serialize the output records to the first operator of the DataStream API. Afterwards, the Types semantics of the DataStream API need to be considered.

If the input table contains a single rowtime column, it will be propagated into a stream record’s timestamp. Watermarks will be propagated as well.

If the rowtime should not be a concrete field in the final Row anymore, or the schema should be symmetrical for both from_changelog_stream() and to_changelog_stream(), the rowtime can also be declared as a metadata column that will be propagated into a stream record’s timestamp. It is possible to declare a schema without physical/regular columns. In this case, those columns will be automatically derived and implicitly put at the beginning of the schema declaration.

The following examples illustrate common schema declarations and their semantics:

Example:

given a Table of (id INT, name STRING, my_rowtime TIMESTAMP_LTZ(3))

=== EXAMPLE 1 ===

no physical columns defined, they will be derived automatically,
the last derived physical column will be skipped in favor of the metadata column

>>> Schema.new_builder()             ...     .column_by_metadata("rowtime", "TIMESTAMP_LTZ(3)")             ...     .build()

equal to: CREATE TABLE (id INT, name STRING, rowtime TIMESTAMP_LTZ(3) METADATA)

=== EXAMPLE 2 ===

physical columns defined, all columns must be defined

>>> Schema.new_builder()             ...     .column("id", "INT")             ...     .column("name", "STRING")             ...     .column_by_metadata("rowtime", "TIMESTAMP_LTZ(3)")             ...     .build()

equal to: CREATE TABLE (id INT, name STRING, rowtime TIMESTAMP_LTZ(3) METADATA)

Parameters

table – The Table to convert. It can be updating or insert-only.
target_schema – The Schema that decides about the final external representation in DataStream records.
changelog_mode – The required kinds of changes in the result changelog. An exception will be thrown if the given updating table cannot be represented in this changelog mode.

Returns

The converted changelog stream of Row.

to_data_stream(table: pyflink.table.table.Table) → pyflink.datastream.data_stream.DataStream[source]¶

Converts the given Table into a DataStream.

Since the DataStream API does not support changelog processing natively, this method assumes append-only/insert-only semantics during the table-to-stream conversion. The records of class Row will always describe RowKind#INSERT changes. Updating tables are not supported by this method and will produce an exception.

Note that the type system of the table ecosystem is richer than the one of the DataStream API. The table runtime will make sure to properly serialize the output records to the first operator of the DataStream API. Afterwards, the Types semantics of the DataStream API need to be considered.

If the input table contains a single rowtime column, it will be propagated into a stream record’s timestamp. Watermarks will be propagated as well.

Parameters: table – The Table to convert.
Returns: The converted DataStream.

to_retract_stream(table: pyflink.table.table.Table, type_info: pyflink.common.typeinfo.TypeInformation) → pyflink.datastream.data_stream.DataStream[source]¶

Converts the given Table into a DataStream of add and retract messages. The message will be encoded as Tuple. The first field is a boolean flag, the second field holds the record of the specified type.

A true flag indicates an add message, a false flag indicates a retract message.

The fields of the Table are mapped to DataStream as follows: Row and Tuple types: Fields are mapped by position, field types must match.

Parameters

table – The Table to convert.
type_info – The TypeInformation of the requested record type.

Returns

The converted DataStream.

New in version 1.12.0.

class pyflink.table.Table(j_table, t_env)[source]¶

Bases: object

A Table object is the core abstraction of the Table API. Similar to how the DataStream API has DataStream, the Table API is built around Table.

A Table object describes a pipeline of data transformations. It does not contain the data itself in any way. Instead, it describes how to read data from a table source, and how to eventually write data to a table sink. The declared pipeline can be printed, optimized, and eventually executed in a cluster. The pipeline can work with bounded or unbounded streams which enables both streaming and batch scenarios.

By the definition above, a Table object can actually be considered as a view in SQL terms.

The initial Table object is constructed by a TableEnvironment. For example, from_path() obtains a table from a catalog. Every Table object has a schema that is available through get_schema(). A Table object is always associated with its original table environment during programming.

Every transformation (i.e. select()} or filter() on a Table object leads to a new Table object.

Use execute() to execute the pipeline and retrieve the transformed data locally during development. Otherwise, use execute_insert() to write the data into a table sink.

Many methods of this class take one or more Expression as parameters. For fluent definition of expressions and easier readability, we recommend to add a star import:

Example:

>>> from pyflink.table.expressions import *

Check the documentation for more programming language specific APIs.

The following example shows how to work with a Table object.

Example:

>>> from pyflink.table import EnvironmentSettings, TableEnvironment
>>> from pyflink.table.expressions import *
>>> env_settings = EnvironmentSettings.in_streaming_mode()
>>> t_env = TableEnvironment.create(env_settings)
>>> table = t_env.from_path("my_table").select(col("colA").trim(), col("colB") + 12)
>>> table.execute().print()

add_columns(*fields: pyflink.table.expression.Expression) → pyflink.table.table.Table[source]¶

Adds additional columns. Similar to a SQL SELECT statement. The field expressions can contain complex expressions, but can not contain aggregations. It will throw an exception if the added fields already exist.

Example:

>>> from pyflink.table.expressions import col, concat
>>> tab.add_columns((col('a') + 1).alias('a1'), concat(col('b'), 'sunny').alias('b1'))

Parameters: fields – Column list string.
Returns: The result table.

add_or_replace_columns(*fields: pyflink.table.expression.Expression) → pyflink.table.table.Table[source]¶

Adds additional columns. Similar to a SQL SELECT statement. The field expressions can contain complex expressions, but can not contain aggregations. Existing fields will be replaced if add columns name is the same as the existing column name. Moreover, if the added fields have duplicate field name, then the last one is used.

Example:

>>> from pyflink.table.expressions import col, concat
>>> tab.add_or_replace_columns((col('a') + 1).alias('a1'),
...                            concat(col('b'), 'sunny').alias('b1'))

Parameters: fields – Column list string.
Returns: The result table.

aggregate(func: Union[pyflink.table.expression.Expression, pyflink.table.udf.UserDefinedAggregateFunctionWrapper]) → pyflink.table.table.AggregatedTable[source]¶

Performs a global aggregate operation with an aggregate function. You have to close the aggregate with a select statement.

Example:

>>> agg = udaf(lambda a: (a.mean(), a.max()),
...               result_type=DataTypes.ROW(
...                   [DataTypes.FIELD("a", DataTypes.FLOAT()),
...                    DataTypes.FIELD("b", DataTypes.INT())]),
...               func_type="pandas")
>>> tab.aggregate(agg(col('a')).alias("a", "b")).select(col('a'), col('b'))
>>> # take all the columns as inputs
>>> # pd is a Pandas.DataFrame
>>> agg_row = udaf(lambda pd: (pd.a.mean(), pd.a.max()),
...               result_type=DataTypes.ROW(
...                   [DataTypes.FIELD("a", DataTypes.FLOAT()),
...                    DataTypes.FIELD("b", DataTypes.INT())]),
...               func_type="pandas")
>>> tab.aggregate(agg.alias("a", "b")).select(col('a'), col('b'))

Parameters: func – user-defined aggregate function.
Returns: The result table.

New in version 1.13.0.

alias(field: str, *fields: str) → pyflink.table.table.Table[source]¶

Renames the fields of the expression result. Use this to disambiguate fields before joining two tables.

Example:

>>> tab.alias("a", "b", "c")

Parameters

field – Field alias.
fields – Additional field aliases.

Returns

The result table.

distinct() → pyflink.table.table.Table[source]¶

Removes duplicate values and returns only distinct (different) values.

Example:

>>> tab.select(col('key'), col('value')).distinct()

Returns: The result table.

drop_columns(*fields: pyflink.table.expression.Expression) → pyflink.table.table.Table[source]¶

Drops existing columns. The field expressions should be field reference expressions.

Example:

>>> tab.drop_columns(col('a'), col('b'))

Parameters: fields – Column list string.
Returns: The result table.

execute() → pyflink.table.table_result.TableResult[source]¶

Collects the contents of the current table local client.

Example:

>>> tab.execute()

Returns: The content of the table.

New in version 1.11.0.

execute_insert(table_path_or_descriptor: Union[str, pyflink.table.table_descriptor.TableDescriptor], overwrite: bool = False) → pyflink.table.table_result.TableResult[source]¶

When target_path_or_descriptor is a tale path:
Writes the Table to a TableSink that was registered under the specified name, and then execute the insert operation. For the path resolution algorithm see use_database().

Example:
>>> tab.execute_insert("sink")
When target_path_or_descriptor is a table descriptor:
Declares that the pipeline defined by the given Table object should be written to a table (backed by a DynamicTableSink) expressed via the given TableDescriptor. It executes the insert operation.

TableDescriptor is registered as an inline (i.e. anonymous) temporary catalog table (see create_temporary_table()) using a unique identifier. Note that calling this method multiple times, even with the same descriptor, results in multiple sink tables being registered.

This method allows to declare a Schema for the sink descriptor. The declaration is similar to a {@code CREATE TABLE} DDL in SQL and allows to:
overwrite automatically derived columns with a custom DataType

add metadata columns next to the physical columns

declare a primary key
It is possible to declare a schema without physical/regular columns. In this case, those columns will be automatically derived and implicitly put at the beginning of the schema declaration.

Examples:
>>> schema = Schema.new_builder() ... .column("f0", DataTypes.STRING()) ... .build() >>> table = table_env.from_descriptor(TableDescriptor.for_connector("datagen") ... .schema(schema) ... .build()) >>> table.execute_insert(TableDescriptor.for_connector("blackhole") ... .schema(schema) ... .build())
If multiple pipelines should insert data into one or more sink tables as part of a single execution, use a StatementSet (see create_statement_set()).

By default, all insertion operations are executed asynchronously. Use await() or get_job_client() to monitor the execution.

Note

execute_insert for a table descriptor (case 2.) was added from flink 1.14.0.

Parameters

table_path_or_descriptor – The path of the registered TableSink or the descriptor describing the sink table into which data should be inserted to which the Table is written.
overwrite – Indicates whether the insert should overwrite existing data or not.

Returns

The table result.

New in version 1.11.0.

explain(*extra_details: pyflink.table.explain_detail.ExplainDetail) → str[source]¶

Returns the AST of this table and the execution plan.

Parameters: extra_details – The extra explain details which the explain result should include, e.g. estimated cost, changelog mode for streaming
Returns: The statement for which the AST and execution plan will be returned.

New in version 1.11.0.

fetch(fetch: int) → pyflink.table.table.Table[source]¶

Limits a (possibly sorted) result to the first n rows.

This method can be combined with a preceding order_by() call for a deterministic order and offset() call to return n rows after skipping the first o rows.

Example:

Returns the first 3 records.

>>> tab.order_by(col('name').desc).fetch(3)

Skips the first 10 rows and returns the next 5 rows.

>>> tab.order_by(col('name').desc).offset(10).fetch(5)

Parameters: fetch – The number of records to return. Fetch must be >= 0.
Returns: The result table.

filter(predicate: pyflink.table.expression.Expression[bool]) → pyflink.table.table.Table[source]¶

Filters out elements that don’t pass the filter predicate. Similar to a SQL WHERE clause.

Example:

>>> tab.filter(col('name') == 'Fred')

Parameters: predicate – Predicate expression string.
Returns: The result table.

flat_aggregate(func: Union[pyflink.table.expression.Expression, pyflink.table.udf.UserDefinedAggregateFunctionWrapper]) → pyflink.table.table.FlatAggregateTable[source]¶

Perform a global flat_aggregate without group_by. flat_aggregate takes a TableAggregateFunction which returns multiple rows. Use a selection after the flat_aggregate.

Example:

>>> table_agg = udtaf(MyTableAggregateFunction())
>>> tab.flat_aggregate(table_agg(col('a')).alias("a", "b")).select(col('a'), col('b'))
>>> # take all the columns as inputs
>>> class Top2(TableAggregateFunction):
...     def emit_value(self, accumulator):
...         yield Row(accumulator[0])
...         yield Row(accumulator[1])
...
...     def create_accumulator(self):
...         return [None, None]
...
...     def accumulate(self, accumulator, *args):
...         args[0] # type: Row
...         if args[0][0] is not None:
...             if accumulator[0] is None or args[0][0] > accumulator[0]:
...                 accumulator[1] = accumulator[0]
...                 accumulator[0] = args[0][0]
...             elif accumulator[1] is None or args[0][0] > accumulator[1]:
...                 accumulator[1] = args[0][0]
...
...     def get_accumulator_type(self):
...         return DataTypes.ARRAY(DataTypes.BIGINT())
...
...     def get_result_type(self):
...         return DataTypes.ROW(
...             [DataTypes.FIELD("a", DataTypes.BIGINT())])
>>> top2 = udtaf(Top2())
>>> tab.flat_aggregate(top2.alias("a", "b")).select(col('a'), col('b'))

Parameters: func – user-defined table aggregate function.
Returns: The result table.

New in version 1.13.0.

flat_map(func: Union[pyflink.table.expression.Expression, pyflink.table.udf.UserDefinedTableFunctionWrapper]) → pyflink.table.table.Table[source]¶

Performs a flatMap operation with a user-defined table function.

Example:

>>> @udtf(result_types=[DataTypes.INT(), DataTypes.STRING()])
... def split(x, string):
...     for s in string.split(","):
...         yield x, s
>>> tab.flat_map(split(col('a'), col('b')))
>>> # take all the columns as inputs
>>> @udtf(result_types=[DataTypes.INT(), DataTypes.STRING()])
... def split_row(row: Row):
...     for s in row[1].split(","):
...         yield row[0], s
>>> tab.flat_map(split_row)

Parameters: func – user-defined table function.
Returns: The result table.

New in version 1.13.0.

full_outer_join(right: pyflink.table.table.Table, join_predicate: pyflink.table.expression.Expression[bool]) → pyflink.table.table.Table[source]¶

Joins two Table. Similar to a SQL full outer join. The fields of the two joined operations must not overlap, use alias() to rename fields if necessary.

Note

Both tables must be bound to the same TableEnvironment and its TableConfig must have null check enabled (default).

Example:

>>> left.full_outer_join(right, col('a') == col('b'))

Parameters

right – Right table.
join_predicate – The join predicate expression string.

Returns

The result table.

get_schema() → pyflink.table.table_schema.TableSchema[source]¶

Returns the TableSchema of this table.

Returns: The schema of this table.

group_by(*fields: pyflink.table.expression.Expression) → pyflink.table.table.GroupedTable[source]¶

Groups the elements on some grouping keys. Use this before a selection with aggregations to perform the aggregation on a per-group basis. Similar to a SQL GROUP BY statement.

Example:

>>> tab.group_by(col('key')).select(col('key'), col('value').avg)

Parameters: fields – Group keys.
Returns: The grouped table.

intersect(right: pyflink.table.table.Table) → pyflink.table.table.Table[source]¶

Intersects two Table with duplicate records removed. Intersect returns records that exist in both tables. If a record is present in one or both tables more than once, it is returned just once, i.e., the resulting table has no duplicate records. Similar to a SQL INTERSECT. The fields of the two intersect operations must fully overlap.

Note

Both tables must be bound to the same TableEnvironment.

Example:

>>> left.intersect(right)

Parameters: right – Right table.
Returns: The result table.

intersect_all(right: pyflink.table.table.Table) → pyflink.table.table.Table[source]¶

Intersects two Table. IntersectAll returns records that exist in both tables. If a record is present in both tables more than once, it is returned as many times as it is present in both tables, i.e., the resulting table might have duplicate records. Similar to an SQL INTERSECT ALL. The fields of the two intersect operations must fully overlap.

Note

Both tables must be bound to the same TableEnvironment.

Example:

>>> left.intersect_all(right)

Parameters: right – Right table.
Returns: The result table.

join(right: pyflink.table.table.Table, join_predicate: pyflink.table.expression.Expression[bool] = None)[source]¶

Joins two Table. Similar to a SQL join. The fields of the two joined operations must not overlap, use alias() to rename fields if necessary. You can use where and select clauses after a join to further specify the behaviour of the join.

Note

Both tables must be bound to the same TableEnvironment .

Example:

>>> left.join(right).where((col('a') == col('b')) && (col('c') > 3))
>>> left.join(right, col('a') == col('b'))

Parameters

right – Right table.
join_predicate – Optional, the join predicate expression string.

Returns

The result table.

join_lateral(table_function_call: Union[pyflink.table.expression.Expression, pyflink.table.udf.UserDefinedTableFunctionWrapper], join_predicate: pyflink.table.expression.Expression[bool] = None) → pyflink.table.table.Table[source]¶

Joins this Table with an user-defined TableFunction. This join is similar to a SQL inner join but works with a table function. Each row of the table is joined with the rows produced by the table function.

Example:

>>> from pyflink.table.expressions import *
>>> t_env.create_java_temporary_system_function("split",
...     "java.table.function.class.name")
>>> tab.join_lateral(call('split', ' ').alias('b'), col('a') == col('b'))
>>> # take all the columns as inputs
>>> @udtf(result_types=[DataTypes.INT(), DataTypes.STRING()])
... def split_row(row: Row):
...     for s in row[1].split(","):
...         yield row[0], s
>>> tab.join_lateral(split_row.alias("a", "b"))

Parameters

table_function_call – An expression representing a table function call.
join_predicate – Optional, The join predicate expression string, join ON TRUE if not exist.

Returns

The result Table.

left_outer_join(right: pyflink.table.table.Table, join_predicate: pyflink.table.expression.Expression[bool] = None) → pyflink.table.table.Table[source]¶

Joins two Table. Similar to a SQL left outer join. The fields of the two joined operations must not overlap, use alias() to rename fields if necessary.

Note

Both tables must be bound to the same TableEnvironment and its TableConfig must have null check enabled (default).

Example:

>>> left.left_outer_join(right)
>>> left.left_outer_join(right, col('a') == col('b'))

Parameters

right – Right table.
join_predicate – Optional, the join predicate expression string.

Returns

The result table.

left_outer_join_lateral(table_function_call: Union[pyflink.table.expression.Expression, pyflink.table.udf.UserDefinedTableFunctionWrapper], join_predicate: pyflink.table.expression.Expression[bool] = None) → pyflink.table.table.Table[source]¶

Joins this Table with an user-defined TableFunction. This join is similar to a SQL left outer join but works with a table function. Each row of the table is joined with all rows produced by the table function. If the join does not produce any row, the outer row is padded with nulls.

Example:

>>> t_env.create_java_temporary_system_function("split",
...     "java.table.function.class.name")
>>> from pyflink.table.expressions import *
>>> tab.left_outer_join_lateral(call('split', ' ').alias('b'))

>>> # take all the columns as inputs
>>> @udtf(result_types=[DataTypes.INT(), DataTypes.STRING()])
... def split_row(row: Row):
...     for s in row[1].split(","):
...         yield row[0], s
>>> tab.left_outer_join_lateral(split_row.alias("a", "b"))

Parameters

table_function_call – An expression representing a table function call.
join_predicate – Optional, The join predicate expression string, join ON TRUE if not exist.

Returns

The result Table.

limit(fetch: int, offset: int = 0) → pyflink.table.table.Table[source]¶

Limits a (possibly sorted) result to the first n rows.

This method is a synonym for offset() followed by fetch().

Example:

Returns the first 3 records.

>>> tab.limit(3)

Skips the first 10 rows and returns the next 5 rows.

>>> tab.limit(5, 10)

Parameters

fetch – the first number of rows to fetch.
offset – the number of records to skip, default 0.

Returns

The result table.

map(func: Union[pyflink.table.expression.Expression, pyflink.table.udf.UserDefinedScalarFunctionWrapper]) → pyflink.table.table.Table[source]¶

Performs a map operation with a user-defined scalar function.

Example:

>>> add = udf(lambda x: Row(x + 1, x * x), result_type=DataTypes.Row(
... [DataTypes.FIELD("a", DataTypes.INT()), DataTypes.FIELD("b", DataTypes.INT())]))
>>> tab.map(add(col('a'))).alias("a", "b")
>>> # take all the columns as inputs
>>> identity = udf(lambda row: row, result_type=DataTypes.Row(
... [DataTypes.FIELD("a", DataTypes.INT()), DataTypes.FIELD("b", DataTypes.INT())]))
>>> tab.map(identity)

Parameters: func – user-defined scalar function.
Returns: The result table.

New in version 1.13.0.

minus(right: pyflink.table.table.Table) → pyflink.table.table.Table[source]¶

Minus of two Table with duplicate records removed. Similar to a SQL EXCEPT clause. Minus returns records from the left table that do not exist in the right table. Duplicate records in the left table are returned exactly once, i.e., duplicates are removed. Both tables must have identical field types.

Note

Both tables must be bound to the same TableEnvironment.

Example:

>>> left.minus(right)

Parameters: right – Right table.
Returns: The result table.

minus_all(right: pyflink.table.table.Table) → pyflink.table.table.Table[source]¶

Minus of two Table. Similar to a SQL EXCEPT ALL. Similar to a SQL EXCEPT ALL clause. MinusAll returns the records that do not exist in the right table. A record that is present n times in the left table and m times in the right table is returned (n - m) times, i.e., as many duplicates as are present in the right table are removed. Both tables must have identical field types.

Note

Both tables must be bound to the same TableEnvironment.

Example:

>>> left.minus_all(right)

Parameters: right – Right table.
Returns: The result table.

offset(offset: int) → pyflink.table.table.Table[source]¶

Limits a (possibly sorted) result from an offset position.

This method can be combined with a preceding order_by() call for a deterministic order and a subsequent fetch() call to return n rows after skipping the first o rows.

Example:

# skips the first 3 rows and returns all following rows.
>>> tab.order_by(col('name').desc).offset(3)
# skips the first 10 rows and returns the next 5 rows.
>>> tab.order_by(col('name').desc).offset(10).fetch(5)

For unbounded tables, this operation requires a subsequent fetch operation.

Parameters: offset – Number of records to skip.
Returns: The result table.

order_by(*fields: pyflink.table.expression.Expression) → pyflink.table.table.Table[source]¶

Sorts the given Table. Similar to SQL ORDER BY. The resulting Table is sorted globally sorted across all parallel partitions.

Example:

>>> tab.order_by(col('name').desc)

For unbounded tables, this operation requires a sorting on a time attribute or a subsequent fetch operation.

Parameters: fields – Order fields expression string.
Returns: The result table.

over_window(*over_windows: pyflink.table.window.OverWindow) → pyflink.table.table.OverWindowedTable[source]¶

Defines over-windows on the records of a table.

An over-window defines for each record an interval of records over which aggregation functions can be computed.

Example:

>>> from pyflink.table.expressions import col, lit
>>> tab.over_window(Over.partition_by(col('c')).order_by(col('rowtime')) \
...     .preceding(lit(10).seconds).alias("ow")) \
...     .select(col('c'), col('b').count.over(col('ow'), col('e').sum.over(col('ow'))))

Note

Computing over window aggregates on a streaming table is only a parallel operation if the window is partitioned. Otherwise, the whole stream will be processed by a single task, i.e., with parallelism 1.

Note

Over-windows for batch tables are currently not supported.

Parameters: over_windows – over windows created from Over.
Returns: A over windowed table.

print_schema()[source]¶: Prints the schema of this table to the console in a tree format.

rename_columns(*fields: pyflink.table.expression.Expression) → pyflink.table.table.Table[source]¶

Renames existing columns. Similar to a field alias statement. The field expressions should be alias expressions, and only the existing fields can be renamed.

Example:

>>> tab.rename_columns(col('a').alias('a1'), col('b').alias('b1'))

Parameters: fields – Column list string.
Returns: The result table.

right_outer_join(right: pyflink.table.table.Table, join_predicate: pyflink.table.expression.Expression[bool]) → pyflink.table.table.Table[source]¶

Joins two Table. Similar to a SQL right outer join. The fields of the two joined operations must not overlap, use alias() to rename fields if necessary.

Note

Both tables must be bound to the same TableEnvironment and its TableConfig must have null check enabled (default).

Example:

>>> left.right_outer_join(right, col('a') == col('b'))

Parameters

right – Right table.
join_predicate – The join predicate expression string.

Returns

The result table.

select(*fields: pyflink.table.expression.Expression) → pyflink.table.table.Table[source]¶

Performs a selection operation. Similar to a SQL SELECT statement. The field expressions can contain complex expressions.

Example:

>>> from pyflink.table.expressions import col, concat
>>> tab.select(tab.key, concat(tab.value, 'hello'))
>>> tab.select(col('key'), concat(col('value'), 'hello'))

Returns: The result table.

to_pandas()[source]¶

Converts the table to a pandas DataFrame. It will collect the content of the table to the client side and so please make sure that the content of the table could fit in memory before calling this method.

Example:

>>> pdf = pd.DataFrame(np.random.rand(1000, 2))
>>> table = table_env.from_pandas(pdf, ["a", "b"])
>>> table.filter(col('a') > 0.5).to_pandas()

Returns: the result pandas DataFrame.

New in version 1.11.0.

union(right: pyflink.table.table.Table) → pyflink.table.table.Table[source]¶

Unions two Table with duplicate records removed. Similar to a SQL UNION. The fields of the two union operations must fully overlap.

Note

Both tables must be bound to the same TableEnvironment.

Example:

>>> left.union(right)

Parameters: right – Right table.
Returns: The result table.

union_all(right: pyflink.table.table.Table) → pyflink.table.table.Table[source]¶

Unions two Table. Similar to a SQL UNION ALL. The fields of the two union operations must fully overlap.

Note

Both tables must be bound to the same TableEnvironment.

Example:

>>> left.union_all(right)

Parameters: right – Right table.
Returns: The result table.

where(predicate: pyflink.table.expression.Expression[bool]) → pyflink.table.table.Table[source]¶

Filters out elements that don’t pass the filter predicate. Similar to a SQL WHERE clause.

Example:

>>> tab.where(col('name') == 'Fred')

Parameters: predicate – Predicate expression string.
Returns: The result table.

window(window: pyflink.table.window.GroupWindow) → pyflink.table.table.GroupWindowedTable[source]¶

Defines group window on the records of a table.

A group window groups the records of a table by assigning them to windows defined by a time or row interval.

For streaming tables of infinite size, grouping into windows is required to define finite groups on which group-based aggregates can be computed.

For batch tables of finite size, windowing essentially provides shortcuts for time-based groupBy.

Note

Computing windowed aggregates on a streaming table is only a parallel operation if additional grouping attributes are added to the group_by() clause. If the group_by() only references a GroupWindow alias, the streamed table will be processed by a single task, i.e., with parallelism 1.

Example:

>>> from pyflink.table.expressions import col, lit
>>> tab.window(Tumble.over(lit(10).minutes).on(col('rowtime')).alias('w')) \
...     .group_by(col('w')) \
...     .select(col('a').sum.alias('a'),
...             col('w').start.alias('b'),
...             col('w').end.alias('c'),
...             col('w').rowtime.alias('d'))

Parameters: window – A GroupWindow created from Tumble, Session or Slide.
Returns: A group windowed table.

class pyflink.table.TableAggregateFunction(*args, **kwds)[source]¶

Bases: pyflink.table.udf.ImperativeAggregateFunction

Base class for a user-defined table aggregate function. A user-defined table aggregate function maps scalar values of multiple rows to zero, one, or multiple rows (or structured types). If an output record consists of only one field, the structured record can be omitted, and a scalar value can be emitted that will be implicitly wrapped into a row by the runtime.

New in version 1.13.0.

abstract emit_value(accumulator: ACC) → Iterable[T][source]¶

Called every time when an aggregation result should be materialized. The returned value could be either an early and incomplete result (periodically emitted as data arrives) or the final result of the aggregation.

Parameters: accumulator – the accumulator which contains the current aggregated results.
Returns: multiple aggregated result

class pyflink.table.TableConfig(j_table_config=None)[source]¶

Bases: object

Configuration for the current TableEnvironment session to adjust Table & SQL API programs.

This class is a pure API class that abstracts configuration from various sources. Currently, configuration can be set in any of the following layers (in the given order):

flink-conf.yaml
CLI parameters
StreamExecutionEnvironment when bridging to DataStream API
with_configuration()
set()

The latter two represent the application-specific part of the configuration. They initialize and directly modify get_configuration(). Other layers represent the configuration of the execution context and are immutable.

The getter get() gives read-only access to the full configuration. However, application-specific configuration has precedence. Configuration of outer layers is used for defaults and fallbacks. The setter set() will only affect application-specific configuration.

For common or important configuration options, this class provides getters and setters methods with detailed inline documentation.

For more advanced configuration, users can directly access the underlying key-value map via get_configuration().

Example:

>>> table_config = t_env.get_config()
>>> config = Configuration()
>>> config.set_string("parallelism.default", "128") \
...       .set_string("pipeline.auto-watermark-interval", "800ms") \
...       .set_string("execution.checkpointing.interval", "30s")
>>> table_config.add_configuration(config)

Note

Because options are read at different point in time when performing operations, it is recommended to set configuration options early after instantiating a table environment.

add_configuration(configuration: pyflink.common.configuration.Configuration)[source]¶

Adds the given key-value configuration to the underlying configuration. It overwrites existing keys.

Parameters: configuration – Key-value configuration to be added.

get(key: str, default_value: str) → str[source]¶

Returns the value associated with the given key as a string.

Parameters

key – The key pointing to the associated value.
default_value – The default value which is returned in case there is no value associated with the given key.

Returns

The (default) value associated with the given key.

get_configuration() → pyflink.common.configuration.Configuration[source]¶

Gives direct access to the underlying key-value map for advanced configuration.

Returns: Entire key-value configuration.

static get_default() → pyflink.table.table_config.TableConfig[source]¶

Returns: A TableConfig object with default settings.

get_idle_state_retention() → datetime.timedelta[source]¶

Returns: The duration until state which was not updated will be retained.

get_local_timezone() → str[source]¶: Returns the local timezone id for timestamp with local time zone, either an abbreviation such as “PST”, a full name such as “America/Los_Angeles”, or a custom timezone_id such as “GMT-08:00”.

get_max_generated_code_length() → int[source]¶: The current threshold where generated code will be split into sub-function calls. Java has a maximum method length of 64 KB. This setting allows for finer granularity if necessary. Default is 64000.

get_max_idle_state_retention_time() → int[source]¶

State will be cleared and removed if it was not updated for the defined period of time.

Note

Currently the concept of min/max idle state retention has been deprecated and only idle state retention time is supported. The min idle state retention is regarded as idle state retention and the max idle state retention is derived from idle state retention as 1.5 x idle state retention.

Returns: The maximum time until state which was not updated will be retained.

get_min_idle_state_retention_time() → int[source]¶

State might be cleared and removed if it was not updated for the defined period of time.

Note

Currently the concept of min/max idle state retention has been deprecated and only idle state retention time is supported. The min idle state retention is regarded as idle state retention and the max idle state retention is derived from idle state retention as 1.5 x idle state retention.

Returns: The minimum time until state which was not updated will be retained.

get_python_executable() → str[source]¶

Gets the path of the python interpreter which is used to execute the python udf workers. If no path is specified before, it will return a None value.

Returns: The path of the python interpreter which is used to execute the python udf workers.

New in version 1.10.0.

get_sql_dialect() → pyflink.table.sql_dialect.SqlDialect[source]¶: Returns the current SQL dialect.

set(key: str, value: str) → pyflink.table.table_config.TableConfig[source]¶

Sets a string-based value for the given string-based key.

The value will be parsed by the framework on access.

set_idle_state_retention(duration: datetime.timedelta)[source]¶

Specifies a retention time interval for how long idle state, i.e., state which was not updated, will be retained.

State will never be cleared until it was idle for less than the duration and will never be kept if it was idle for more than the 1.5 x duration.

When new data arrives for previously cleaned-up state, the new data will be handled as if it was the first data. This can result in previous results being overwritten.

Set to 0 (zero) to never clean-up the state.

Example:

>>> table_config.set_idle_state_retention(datetime.timedelta(days=1))

Note

Cleaning up state requires additional bookkeeping which becomes less expensive for larger differences of minTime and maxTime. The difference between minTime and maxTime must be at least 5 minutes.

Parameters: duration – The retention time interval for which idle state is retained. Set to 0 (zero) to never clean-up the state.

set_idle_state_retention_time(min_time: datetime.timedelta, max_time: datetime.timedelta)[source]¶

Specifies a minimum and a maximum time interval for how long idle state, i.e., state which was not updated, will be retained.

State will never be cleared until it was idle for less than the minimum time and will never be kept if it was idle for more than the maximum time.

When new data arrives for previously cleaned-up state, the new data will be handled as if it was the first data. This can result in previous results being overwritten.

Set to 0 (zero) to never clean-up the state.

Example:

>>> table_config = TableConfig() \
...     .set_idle_state_retention_time(datetime.timedelta(days=1),
...                                    datetime.timedelta(days=3))

Note

Cleaning up state requires additional bookkeeping which becomes less expensive for larger differences of minTime and maxTime. The difference between minTime and maxTime must be at least 5 minutes.

Method set_idle_state_retention_time is deprecated now. The suggested way to set idle state retention time is set_idle_state_retention() Currently, setting max_time will not work and the max_time is directly derived from the min_time as 1.5 x min_time.

Parameters

min_time – The minimum time interval for which idle state is retained. Set to 0 (zero) to never clean-up the state.
max_time – The maximum time interval for which idle state is retained. Must be at least 5 minutes greater than minTime. Set to 0 (zero) to never clean-up the state.

set_local_timezone(timezone_id: str)[source]¶

Sets the local timezone id for timestamp with local time zone.

Parameters: timezone_id – The timezone id, either an abbreviation such as “PST”, a full name such as “America/Los_Angeles”, or a custom timezone_id such as “GMT-08:00”.

set_max_generated_code_length(max_generated_code_length: int)[source]¶: Returns the current threshold where generated code will be split into sub-function calls. Java has a maximum method length of 64 KB. This setting allows for finer granularity if necessary. Default is 64000.

set_python_executable(python_exec: str)[source]¶

Sets the path of the python interpreter which is used to execute the python udf workers.

e.g. “/usr/local/bin/python3”.

If python UDF depends on a specific python version which does not exist in the cluster, the method pyflink.table.TableEnvironment.add_python_archive() can be used to upload a virtual environment. The path of the python interpreter contained in the uploaded environment can be specified via this method.

Example:

# command executed in shell
# assume that the relative path of python interpreter is py_env/bin/python
$ zip -r py_env.zip py_env

# python code
>>> table_env.add_python_archive("py_env.zip")
>>> table_env.get_config().set_python_executable("py_env.zip/py_env/bin/python")

Note

Please make sure the uploaded python environment matches the platform that the cluster is running on and that the python version must be 3.6 or higher.

Note

The python udf worker depends on Apache Beam (version == 2.38.0). Please ensure that the specified environment meets the above requirements.

Parameters: python_exec – The path of python interpreter.

New in version 1.10.0.

set_sql_dialect(sql_dialect: pyflink.table.sql_dialect.SqlDialect)[source]¶

Sets the current SQL dialect to parse a SQL query. Flink’s SQL behavior by default.

Parameters: sql_dialect – The given SQL dialect.

class pyflink.table.TableDescriptor(j_table_descriptor)[source]¶

Bases: object

Describes a CatalogTable representing a source or sink.

TableDescriptor is a template for creating a CatalogTable instance. It closely resembles the “CREATE TABLE” SQL DDL statement, containing schema, connector options, and other characteristics. Since tables in Flink are typically backed by external systems, the descriptor describes how a connector (and possibly its format) are configured.

This can be used to register a table in the Table API, see create_temporary_table() in TableEnvironment.

class Builder(j_builder)[source]¶

Bases: object

Builder for TableDescriptor.

build() → pyflink.table.table_descriptor.TableDescriptor[source]¶: Returns an immutable instance of TableDescriptor.

comment(comment: str) → pyflink.table.table_descriptor.TableDescriptor.Builder[source]¶: Define the comment for this table.

format(format: Union[str, FormatDescriptor], format_option: pyflink.common.config_options.ConfigOption[str] = None) → pyflink.table.table_descriptor.TableDescriptor.Builder[source]¶

Defines the format to be used for this table.

Note that not every connector requires a format to be specified, while others may use multiple formats.

Example:

>>> TableDescriptor.for_connector("kafka")                 ...     .format(FormatDescriptor.for_format("json")
...                 .option("ignore-parse-errors", "true")
...                 .build())

will result in the options:

    'format' = 'json'
    'json.ignore-parse-errors' = 'true'

option(key: Union[str, pyflink.common.config_options.ConfigOption], value) → pyflink.table.table_descriptor.TableDescriptor.Builder[source]¶

Sets the given option on the table.

Option keys must be fully specified. When defining options for a Format, use format(FormatDescriptor) instead.

Example:

>>> TableDescriptor.for_connector("kafka")                 ...     .option("scan.startup.mode", "latest-offset")                 ...     .build()

partitioned_by(*partition_keys: str) → pyflink.table.table_descriptor.TableDescriptor.Builder[source]¶: Define which columns this table is partitioned by.

schema(schema: pyflink.table.schema.Schema) → pyflink.table.table_descriptor.TableDescriptor.Builder[source]¶: Define the schema of the TableDescriptor.

static for_connector(connector: str) → pyflink.table.table_descriptor.TableDescriptor.Builder[source]¶

Creates a new Builder for a table using the given connector.

Parameters: connector – The factory identifier for the connector.

get_comment() → Optional[str][source]¶

get_options() → Dict[str, str][source]¶

get_partition_keys() → List[str][source]¶

get_schema() → Optional[pyflink.table.schema.Schema][source]¶

class pyflink.table.TableEnvironment(j_tenv, serializer=PickleSerializer())[source]¶

Bases: object

A table environment is the base class, entry point, and central context for creating Table and SQL API programs.

It is unified for bounded and unbounded data processing.

A table environment is responsible for:

Connecting to external systems.

Registering and retrieving Table and other meta objects from a catalog.

Executing SQL statements.

Offering further configuration options.

The path in methods such as create_temporary_view() should be a proper SQL identifier. The syntax is following [[catalog-name.]database-name.]object-name, where the catalog name and database are optional. For path resolution see use_catalog() and use_database(). All keywords or other special characters need to be escaped.

Example: cat.1.`db`.`Table` resolves to an object named ‘Table’ (table is a reserved keyword, thus must be escaped) in a catalog named ‘cat.1’ and database named ‘db’.

Note

This environment is meant for pure table programs. If you would like to convert from or to other Flink APIs, it might be necessary to use one of the available language-specific table environments in the corresponding bridging modules.

add_python_archive(archive_path: str, target_dir: str = None)[source]¶

Adds a python archive file. The file will be extracted to the working directory of python UDF worker.

If the parameter “target_dir” is specified, the archive file will be extracted to a directory named ${target_dir}. Otherwise, the archive file will be extracted to a directory with the same name of the archive file.

If python UDF depends on a specific python version which does not exist in the cluster, this method can be used to upload the virtual environment. Note that the path of the python interpreter contained in the uploaded environment should be specified via the method pyflink.table.TableConfig.set_python_executable().

The files uploaded via this method are also accessible in UDFs via relative path.

Example:

# command executed in shell
# assert the relative path of python interpreter is py_env/bin/python
$ zip -r py_env.zip py_env

# python code
>>> table_env.add_python_archive("py_env.zip")
>>> table_env.get_config().set_python_executable("py_env.zip/py_env/bin/python")

# or
>>> table_env.add_python_archive("py_env.zip", "myenv")
>>> table_env.get_config().set_python_executable("myenv/py_env/bin/python")

# the files contained in the archive file can be accessed in UDF
>>> def my_udf():
...     with open("myenv/py_env/data/data.txt") as f:
...         ...

Note

Please make sure the uploaded python environment matches the platform that the cluster is running on and that the python version must be 3.5 or higher.

Note

Currently only zip-format is supported. i.e. zip, jar, whl, egg, etc. The other archive formats such as tar, tar.gz, 7z, rar, etc are not supported.

Parameters

archive_path – The archive file path.
target_dir – Optional, the target dir name that the archive file extracted to.

New in version 1.10.0.

add_python_file(file_path: str)[source]¶

Adds a python dependency which could be python files, python packages or local directories. They will be added to the PYTHONPATH of the python UDF worker. Please make sure that these dependencies can be imported.

Parameters: file_path – The path of the python dependency.

New in version 1.10.0.

static create(environment_settings: Union[pyflink.table.environment_settings.EnvironmentSettings, pyflink.common.configuration.Configuration]) → pyflink.table.table_environment.TableEnvironment[source]¶

Creates a table environment that is the entry point and central context for creating Table and SQL API programs.

Parameters: environment_settings – The configuration or environment settings used to instantiate the TableEnvironment, the name is for backward compatibility.
Returns: The TableEnvironment.

create_java_function(path: str, function_class_name: str, ignore_if_exists: bool = None)[source]¶

Registers a java user defined function class as a catalog function in the given path.

Compared to system functions with a globally defined name, catalog functions are always (implicitly or explicitly) identified by a catalog and database.

There must not be another function (temporary or permanent) registered under the same path.

Example:

>>> table_env.create_java_function("func", "java.user.defined.function.class.name")

Parameters

path – The path under which the function will be registered. See also the TableEnvironment class description for the format of the path.
function_class_name – The java full qualified class name of the function class containing the implementation. The function must have a public no-argument constructor and can be founded in current Java classloader.
ignore_if_exists – If a function exists under the given path and this flag is set, no operation is executed. An exception is thrown otherwise.

New in version 1.12.0.

create_java_temporary_function(path: str, function_class_name: str)[source]¶

Registers a java user defined function class as a temporary catalog function.

Compared to .. seealso:: create_java_temporary_system_function() with a globally defined name, catalog functions are always (implicitly or explicitly) identified by a catalog and database.

Temporary functions can shadow permanent ones. If a permanent function under a given name exists, it will be inaccessible in the current session. To make the permanent function available again one can drop the corresponding temporary function.

Example:

>>> table_env.create_java_temporary_function("func",
...     "java.user.defined.function.class.name")

Parameters

path – The path under which the function will be registered. See also the TableEnvironment class description for the format of the path.
function_class_name – The java full qualified class name of the function class containing the implementation. The function must have a public no-argument constructor and can be founded in current Java classloader.

New in version 1.12.0.

create_java_temporary_system_function(name: str, function_class_name: str)[source]¶

Registers a java user defined function class as a temporary system function.

Compared to .. seealso:: create_java_temporary_function(), system functions are identified by a global name that is independent of the current catalog and current database. Thus, this method allows to extend the set of built-in system functions like TRIM, ABS, etc.

Temporary functions can shadow permanent ones. If a permanent function under a given name exists, it will be inaccessible in the current session. To make the permanent function available again one can drop the corresponding temporary system function.

Example:

>>> table_env.create_java_temporary_system_function("func",
...     "java.user.defined.function.class.name")

Parameters

name – The name under which the function will be registered globally.
function_class_name – The java full qualified class name of the function class containing the implementation. The function must have a public no-argument constructor and can be founded in current Java classloader.

New in version 1.12.0.

create_statement_set() → pyflink.table.statement_set.StatementSet[source]¶

Create a StatementSet instance which accepts DML statements or Tables, the planner can optimize all added statements and Tables together and then submit as one job.

:return statement_set instance

New in version 1.11.0.

create_table(path: str, descriptor: pyflink.table.table_descriptor.TableDescriptor)[source]¶

Registers the given TableDescriptor as a catalog table.

The TableDescriptor is converted into a CatalogTable and stored in the catalog.

If the table should not be permanently stored in a catalog, use create_temporary_table() instead.

Examples:

>>> table_env.create_table("MyTable", TableDescriptor.for_connector("datagen")
...     .schema(Schema.new_builder()
...                   .column("f0", DataTypes.STRING())
...                   .build())
...     .option("rows-per-second", 10)
...     .option("fields.f0.kind", "random")
...     .build())

Parameters

path – The path under which the table will be registered.
descriptor – Template for creating a CatalogTable instance.

New in version 1.14.0.

create_temporary_function(path: str, function: Union[pyflink.table.udf.UserDefinedFunctionWrapper, pyflink.table.udf.AggregateFunction])[source]¶

Registers a python user defined function class as a temporary catalog function.

Compared to .. seealso:: create_temporary_system_function() with a globally defined name, catalog functions are always (implicitly or explicitly) identified by a catalog and database.

Temporary functions can shadow permanent ones. If a permanent function under a given name exists, it will be inaccessible in the current session. To make the permanent function available again one can drop the corresponding temporary function.

Example:

>>> table_env.create_temporary_function(
...     "add_one", udf(lambda i: i + 1, result_type=DataTypes.BIGINT()))

>>> @udf(result_type=DataTypes.BIGINT())
... def add(i, j):
...     return i + j
>>> table_env.create_temporary_function("add", add)

>>> class SubtractOne(ScalarFunction):
...     def eval(self, i):
...         return i - 1
>>> table_env.create_temporary_function(
...     "subtract_one", udf(SubtractOne(), result_type=DataTypes.BIGINT()))

Parameters

path – The path under which the function will be registered. See also the TableEnvironment class description for the format of the path.
function – The function class containing the implementation. The function must have a public no-argument constructor and can be founded in current Java classloader.

New in version 1.12.0.

create_temporary_system_function(name: str, function: Union[pyflink.table.udf.UserDefinedFunctionWrapper, pyflink.table.udf.AggregateFunction])[source]¶

Registers a python user defined function class as a temporary system function.

Compared to .. seealso:: create_temporary_function(), system functions are identified by a global name that is independent of the current catalog and current database. Thus, this method allows to extend the set of built-in system functions like TRIM, ABS, etc.

Temporary functions can shadow permanent ones. If a permanent function under a given name exists, it will be inaccessible in the current session. To make the permanent function available again one can drop the corresponding temporary system function.

Example:

>>> table_env.create_temporary_system_function(
...     "add_one", udf(lambda i: i + 1, result_type=DataTypes.BIGINT()))

>>> @udf(result_type=DataTypes.BIGINT())
... def add(i, j):
...     return i + j
>>> table_env.create_temporary_system_function("add", add)

>>> class SubtractOne(ScalarFunction):
...     def eval(self, i):
...         return i - 1
>>> table_env.create_temporary_system_function(
...     "subtract_one", udf(SubtractOne(), result_type=DataTypes.BIGINT()))

Parameters

name – The name under which the function will be registered globally.
function – The function class containing the implementation. The function must have a public no-argument constructor and can be founded in current Java classloader.

New in version 1.12.0.

create_temporary_table(path: str, descriptor: pyflink.table.table_descriptor.TableDescriptor)[source]¶

Registers the given TableDescriptor as a temporary catalog table.

The TableDescriptor is converted into a CatalogTable and stored in the catalog.

Temporary objects can shadow permanent ones. If a permanent object in a given path exists, it will be inaccessible in the current session. To make the permanent object available again one can drop the corresponding temporary object.

Examples:

>>> table_env.create_temporary_table("MyTable", TableDescriptor.for_connector("datagen")
...     .schema(Schema.new_builder()
...         .column("f0", DataTypes.STRING())
...         .build())
...     .option("rows-per-second", 10)
...     .option("fields.f0.kind", "random")
...     .build())

Parameters

path – The path under which the table will be registered.
descriptor – Template for creating a CatalogTable instance.

New in version 1.14.0.

create_temporary_view(view_path: str, table_or_data_stream: Union[pyflink.table.table.Table, pyflink.datastream.data_stream.DataStream], *fields_or_schema: Union[str, pyflink.table.expression.Expression, pyflink.table.schema.Schema])[source]¶

When table_or_data_stream is a Table:

Registers a Table API object as a temporary view similar to SQL temporary views.

Temporary objects can shadow permanent ones. If a permanent object in a given path exists, it will be inaccessible in the current session. To make the permanent object available again you can drop the corresponding temporary object.
When table_or_data_stream is a DataStream:
2.1 When fields_or_schema is a str or a sequence of Expression:
Creates a view from the given {@link DataStream} in a given path with specified field names. Registered views can be referenced in SQL queries.

1. Reference input fields by name: All fields in the schema definition are referenced by name (and possibly renamed using an alias (as). Moreover, we can define proctime and rowtime attributes at arbitrary positions using arbitrary names (except those that exist in the result schema). In this mode, fields can be reordered and projected out. This mode can be used for any input type, including POJOs.

Example:

>>> stream = ... # reorder the fields, rename the original 'f0' field to 'name' and add # event-time attribute named 'rowtime' # use str >>> table_env.create_temporary_view( ... "cat.db.myTable", ... stream, ... "f1, rowtime.rowtime, f0 as 'name'") # or use a sequence of expression >>> table_env.create_temporary_view( ... "cat.db.myTable", ... stream, ... col("f1"), ... col("rowtime").rowtime, ... col("f0").alias('name'))

2. Reference input fields by position: In this mode, fields are simply renamed. Event-time attributes can replace the field on their position in the input data (if it is of correct type) or be appended at the end. Proctime attributes must be appended at the end. This mode can only be used if the input type has a defined field order (tuple, case class, Row) and none of the {@code fields} references a field of the input type.

Example:

>>> stream = ... # rename the original fields to 'a' and 'b' and extract the internally attached # timestamp into an event-time attribute named 'rowtime' # use str >>> table_env.create_temporary_view( ... "cat.db.myTable", stream, "a, b, rowtime.rowtime") # or use a sequence of expressions >>> table_env.create_temporary_view( ... "cat.db.myTable", ... stream, ... col("a"), ... col("b"), ... col("rowtime").rowtime)

Temporary objects can shadow permanent ones. If a permanent object in a given path exists, it will be inaccessible in the current session. To make the permanent object available again you can drop the corresponding temporary object.
2.2 When fields_or_schema is a Schema:

Creates a view from the given {@link DataStream} in a given path. Registered views can be referenced in SQL queries.

See from_data_stream() for more information on how a DataStream is translated into a table.

Temporary objects can shadow permanent ones. If a permanent object in a given path exists, it will be inaccessible in the current session. To make the permanent object available again you can drop the corresponding temporary object.

Note

create_temporary_view by providing a Schema (case 2.) was added from flink 1.14.0.

Parameters

view_path – The path under which the view will be registered. See also the TableEnvironment class description for the format of the path.
table_or_data_stream – The Table or DataStream out of which to create the view.
fields_or_schema – The fields expressions(str) to map original fields of the DataStream to the fields of the View or the customized schema for the final table.

New in version 1.10.0.

drop_function(path: str) → bool[source]¶

Drops a catalog function registered in the given path.

Parameters: path – The path under which the function will be registered. See also the TableEnvironment class description for the format of the path.
Returns: true if a function existed in the given path and was removed.

New in version 1.12.0.

drop_temporary_function(path: str) → bool[source]¶

Drops a temporary system function registered under the given name.

If a permanent function with the given name exists, it will be used from now on for any queries that reference this name.

Parameters: path – The path under which the function will be registered. See also the TableEnvironment class description for the format of the path.
Returns: true if a function existed in the given path and was removed.

New in version 1.12.0.

drop_temporary_system_function(name: str) → bool[source]¶

Drops a temporary system function registered under the given name.

If a permanent function with the given name exists, it will be used from now on for any queries that reference this name.

Parameters: name – The name under which the function has been registered globally.
Returns: true if a function existed under the given name and was removed.

New in version 1.12.0.

drop_temporary_table(table_path: str) → bool[source]¶

Drops a temporary table registered in the given path.

If a permanent table with a given path exists, it will be used from now on for any queries that reference this path.

Parameters: table_path – The path of the registered temporary table.
Returns: True if a table existed in the given path and was removed.

New in version 1.10.0.

drop_temporary_view(view_path: str) → bool[source]¶

Drops a temporary view registered in the given path.

If a permanent table or view with a given path exists, it will be used from now on for any queries that reference this path.

Returns: True if a view existed in the given path and was removed.

New in version 1.10.0.

execute_sql(stmt: str) → pyflink.table.table_result.TableResult[source]¶

Execute the given single statement, and return the execution result.

The statement can be DDL/DML/DQL/SHOW/DESCRIBE/EXPLAIN/USE. For DML and DQL, this method returns TableResult once the job has been submitted. For DDL and DCL statements, TableResult is returned once the operation has finished.

:return content for DQL/SHOW/DESCRIBE/EXPLAIN,: the affected row count for DML (-1 means unknown), or a string message (“OK”) for other statements.

New in version 1.11.0.

explain_sql(stmt: str, *extra_details: pyflink.table.explain_detail.ExplainDetail) → str[source]¶

Returns the AST of the specified statement and the execution plan.

Parameters

stmt – The statement for which the AST and execution plan will be returned.
extra_details – The extra explain details which the explain result should include, e.g. estimated cost, changelog mode for streaming

Returns

The statement for which the AST and execution plan will be returned.

New in version 1.11.0.

from_descriptor(descriptor: pyflink.table.table_descriptor.TableDescriptor) → pyflink.table.table.Table[source]¶

Returns a Table backed by the given TableDescriptor.

The TableDescriptor is registered as an inline (i.e. anonymous) temporary table (see create_temporary_table()) using a unique identifier and then read. Note that calling this method multiple times, even with the same descriptor, results in multiple temporary tables. In such cases, it is recommended to register it under a name using create_temporary_table() and reference it via from_path()

Examples:

>>> table_env.from_descriptor(TableDescriptor.for_connector("datagen")
...     .schema(Schema.new_builder()
...         .column("f0", DataTypes.STRING())
...         .build())
...     .build()

Note that the returned Table is an API object and only contains a pipeline description. It actually corresponds to a <i>view</i> in SQL terms. Call execute() in Table to trigger an execution.

Returns: The Table object describing the pipeline for further transformations.

New in version 1.14.0.

from_elements(elements: Iterable, schema: Union[pyflink.table.types.DataType, List[str]] = None, verify_schema: bool = True) → pyflink.table.table.Table[source]¶

Creates a table from a collection of elements. The elements types must be acceptable atomic types or acceptable composite types. All elements must be of the same type. If the elements types are composite types, the composite types must be strictly equal, and its subtypes must also be acceptable types. e.g. if the elements are tuples, the length of the tuples must be equal, the element types of the tuples must be equal in order.

The built-in acceptable atomic element types contains:

int, long, str, unicode, bool, float, bytearray, datetime.date, datetime.time, datetime.datetime, datetime.timedelta, decimal.Decimal

The built-in acceptable composite element types contains:

list, tuple, dict, array, Row

If the element type is a composite type, it will be unboxed. e.g. table_env.from_elements([(1, ‘Hi’), (2, ‘Hello’)]) will return a table like:

_1	_2
1	Hi
2	Hello

“_1” and “_2” are generated field names.

Example:

# use the second parameter to specify custom field names
>>> table_env.from_elements([(1, 'Hi'), (2, 'Hello')], ['a', 'b'])
# use the second parameter to specify custom table schema
>>> table_env.from_elements([(1, 'Hi'), (2, 'Hello')],
...                         DataTypes.ROW([DataTypes.FIELD("a", DataTypes.INT()),
...                                        DataTypes.FIELD("b", DataTypes.STRING())]))
# use the third parameter to switch whether to verify the elements against the schema
>>> table_env.from_elements([(1, 'Hi'), (2, 'Hello')],
...                         DataTypes.ROW([DataTypes.FIELD("a", DataTypes.INT()),
...                                        DataTypes.FIELD("b", DataTypes.STRING())]),
...                         False)
# create Table from expressions
>>> table_env.from_elements([row(1, 'abc', 2.0), row(2, 'def', 3.0)],
...                         DataTypes.ROW([DataTypes.FIELD("a", DataTypes.INT()),
...                                        DataTypes.FIELD("b", DataTypes.STRING()),
...                                        DataTypes.FIELD("c", DataTypes.FLOAT())]))

Parameters

elements – The elements to create a table from.
schema – The schema of the table.
verify_schema – Whether to verify the elements against the schema.

Returns

The result table.

from_pandas(pdf, schema: Union[pyflink.table.types.RowType, List[str], Tuple[str], List[pyflink.table.types.DataType], Tuple[pyflink.table.types.DataType]] = None, splits_num: int = 1) → pyflink.table.table.Table[source]¶

Creates a table from a pandas DataFrame.

Example:

>>> pdf = pd.DataFrame(np.random.rand(1000, 2))
# use the second parameter to specify custom field names
>>> table_env.from_pandas(pdf, ["a", "b"])
# use the second parameter to specify custom field types
>>> table_env.from_pandas(pdf, [DataTypes.DOUBLE(), DataTypes.DOUBLE()]))
# use the second parameter to specify custom table schema
>>> table_env.from_pandas(pdf,
...                       DataTypes.ROW([DataTypes.FIELD("a", DataTypes.DOUBLE()),
...                                      DataTypes.FIELD("b", DataTypes.DOUBLE())]))

Parameters

pdf – The pandas DataFrame.
schema – The schema of the converted table.
splits_num – The number of splits the given Pandas DataFrame will be split into. It determines the number of parallel source tasks. If not specified, the default parallelism will be used.

Returns

The result table.

New in version 1.11.0.

from_path(path: str) → pyflink.table.table.Table[source]¶

Reads a registered table and returns the resulting Table.

A table to scan must be registered in the TableEnvironment.

See the documentation of use_database() or use_catalog() for the rules on the path resolution.

Examples:

Reading a table from default catalog and database.

>>> tab = table_env.from_path("tableName")

Reading a table from a registered catalog.

>>> tab = table_env.from_path("catalogName.dbName.tableName")

Reading a table from a registered catalog with escaping. (Table is a reserved keyword). Dots in e.g. a database name also must be escaped.

>>> tab = table_env.from_path("catalogName.`db.Name`.`Table`")

Parameters: path – The path of a table API object to scan.
Returns: Either a table or virtual table (=view).

See also

use_catalog()

See also

use_database()

New in version 1.10.0.

from_table_source(table_source: pyflink.table.sources.TableSource) → pyflink.table.table.Table[source]¶

Creates a table from a table source.

Example:

>>> csv_table_source = CsvTableSource(
...     csv_file_path, ['a', 'b'], [DataTypes.STRING(), DataTypes.BIGINT()])
>>> table_env.from_table_source(csv_table_source)

Parameters: table_source – The table source used as table.
Returns: The result table.

get_catalog(catalog_name: str) → pyflink.table.catalog.Catalog [source]¶

Gets a registered Catalog by name.

Parameters: catalog_name – The name to look up the Catalog.
Returns: The requested catalog, None if there is no registered catalog with given name.

get_config() → pyflink.table.table_config.TableConfig[source]¶

Returns the table config to define the runtime behavior of the Table API.

Returns: Current table config.

get_current_catalog() → str[source]¶

Gets the current default catalog name of the current session.

Returns: The current default catalog name that is used for the path resolution.

See also

use_catalog()

get_current_database() → str[source]¶

Gets the current default database name of the running session.

Returns: The name of the current database of the current catalog.

See also

use_database()

list_catalogs() → List[str][source]¶

Gets the names of all catalogs registered in this environment.

Returns: List of catalog names.

list_databases() → List[str][source]¶

Gets the names of all databases in the current catalog.

Returns: List of database names in the current catalog.

list_full_modules() → List[pyflink.table.module.ModuleEntry][source]¶

Gets the names and statuses of all modules loaded in this environment.

Returns: List of module names and use statuses.

New in version 1.13.0.

list_functions() → List[str][source]¶

Gets the names of all functions in this environment.

Returns: List of the names of all functions in this environment.

New in version 1.10.0.

list_modules() → List[str][source]¶

Gets the names of all modules used in this environment.

Returns: List of module names.

New in version 1.10.0.

list_tables() → List[str][source]¶

Gets the names of all tables and views in the current database of the current catalog. It returns both temporary and permanent tables and views.

Returns: List of table and view names in the current database of the current catalog.

list_temporary_tables() → List[str][source]¶

Gets the names of all temporary tables and views available in the current namespace (the current database of the current catalog).

Returns: A list of the names of all registered temporary tables and views in the current database of the current catalog.

See also

list_tables()

New in version 1.10.0.

list_temporary_views() → List[str][source]¶

Gets the names of all temporary views available in the current namespace (the current database of the current catalog).

Returns: A list of the names of all registered temporary views in the current database of the current catalog.

See also

list_tables()

New in version 1.10.0.

list_user_defined_functions() → List[str][source]¶

Gets the names of all user defined functions registered in this environment.

Returns: List of the names of all user defined functions registered in this environment.

list_views() → List[str][source]¶

Gets the names of all views in the current database of the current catalog. It returns both temporary and permanent views.

Returns: List of view names in the current database of the current catalog.

New in version 1.11.0.

load_module(module_name: str, module: pyflink.table.module.Module)[source]¶

Loads a Module under a unique name. Modules will be kept in the loaded order. ValidationException is thrown when there is already a module with the same name.

Parameters

module_name – Name of the Module.
module – The module instance.

New in version 1.12.0.

register_catalog(catalog_name: str, catalog: pyflink.table.catalog.Catalog)[source]¶

Registers a Catalog under a unique name. All tables registered in the Catalog can be accessed.

Parameters

catalog_name – The name under which the catalog will be registered.
catalog – The catalog to register.

register_function(name: str, function: pyflink.table.udf.UserDefinedFunctionWrapper)[source]¶

Registers a python user-defined function under a unique name. Replaces already existing user-defined function under this name.

Example:

>>> table_env.register_function(
...     "add_one", udf(lambda i: i + 1, result_type=DataTypes.BIGINT()))

>>> @udf(result_type=DataTypes.BIGINT())
... def add(i, j):
...     return i + j
>>> table_env.register_function("add", add)

>>> class SubtractOne(ScalarFunction):
...     def eval(self, i):
...         return i - 1
>>> table_env.register_function(
...     "subtract_one", udf(SubtractOne(), result_type=DataTypes.BIGINT()))

Parameters

name – The name under which the function is registered.
function – The python user-defined function to register.

New in version 1.10.0.

Note

Deprecated in 1.12. Use create_temporary_system_function() instead.

register_java_function(name: str, function_class_name: str)[source]¶

Registers a java user defined function under a unique name. Replaces already existing user-defined functions under this name. The acceptable function type contains ScalarFunction, TableFunction and AggregateFunction.

Example:

>>> table_env.register_java_function("func1", "java.user.defined.function.class.name")

Parameters

name – The name under which the function is registered.
function_class_name – The java full qualified class name of the function to register. The function must have a public no-argument constructor and can be founded in current Java classloader.

Note

Deprecated in 1.12. Use create_java_temporary_system_function() instead.

register_table(name: str, table: pyflink.table.table.Table)[source]¶

Registers a Table under a unique name in the TableEnvironment’s catalog. Registered tables can be referenced in SQL queries.

Example:

>>> tab = table_env.from_elements([(1, 'Hi'), (2, 'Hello')], ['a', 'b'])
>>> table_env.register_table("source", tab)

Parameters

name – The name under which the table will be registered.
table – The table to register.

Note

Deprecated in 1.10. Use create_temporary_view() instead.

register_table_sink(name: str, table_sink: pyflink.table.sinks.TableSink)[source]¶

Registers an external TableSink with given field names and types in this TableEnvironment’s catalog. Registered sink tables can be referenced in SQL DML statements.

Example:

>>> table_env.register_table_sink("sink",
...                               CsvTableSink(["a", "b"],
...                                            [DataTypes.INT(),
...                                             DataTypes.STRING()],
...                                            "./2.csv"))

Parameters

name – The name under which the table sink is registered.
table_sink – The table sink to register.

Note

Deprecated in 1.10. Use execute_sql() instead.

register_table_source(name: str, table_source: pyflink.table.sources.TableSource)[source]¶

Registers an external TableSource in this TableEnvironment’s catalog. Registered tables can be referenced in SQL queries.

Example:

>>> table_env.register_table_source("source",
...                                 CsvTableSource("./1.csv",
...                                                ["a", "b"],
...                                                [DataTypes.INT(),
...                                                 DataTypes.STRING()]))

Parameters

name – The name under which the table source is registered.
table_source – The table source to register.

Note

Deprecated in 1.10. Use execute_sql() instead.

scan(*table_path: str) → pyflink.table.table.Table[source]¶

Scans a registered table and returns the resulting Table. A table to scan must be registered in the TableEnvironment. It can be either directly registered or be an external member of a Catalog.

See the documentation of use_database() or use_catalog() for the rules on the path resolution.

Examples:

Scanning a directly registered table

>>> tab = table_env.scan("tableName")

Scanning a table from a registered catalog

>>> tab = table_env.scan("catalogName", "dbName", "tableName")

Parameters: table_path – The path of the table to scan.
Throws: Exception if no table is found using the given table path.
Returns: The resulting table.

Note

Deprecated in 1.10. Use from_path() instead.

set_python_requirements(requirements_file_path: str, requirements_cache_dir: str = None)[source]¶

Specifies a requirements.txt file which defines the third-party dependencies. These dependencies will be installed to a temporary directory and added to the PYTHONPATH of the python UDF worker.

For the dependencies which could not be accessed in the cluster, a directory which contains the installation packages of these dependencies could be specified using the parameter “requirements_cached_dir”. It will be uploaded to the cluster to support offline installation.

Example:

# commands executed in shell
$ echo numpy==1.16.5 > requirements.txt
$ pip download -d cached_dir -r requirements.txt --no-binary :all:

# python code
>>> table_env.set_python_requirements("requirements.txt", "cached_dir")

Note

Please make sure the installation packages matches the platform of the cluster and the python version used. These packages will be installed using pip, so also make sure the version of Pip (version >= 20.3) and the version of SetupTools (version >= 37.0.0).

Parameters

requirements_file_path – The path of “requirements.txt” file.
requirements_cache_dir – The path of the local directory which contains the installation packages.

New in version 1.10.0.

sql_query(query: str) → pyflink.table.table.Table[source]¶

Evaluates a SQL query on registered tables and retrieves the result as a Table.

All tables referenced by the query must be registered in the TableEnvironment.

A Table is automatically registered when its __str__() method is called, for example when it is embedded into a String.

Hence, SQL queries can directly reference a Table as follows:

>>> table = ...
# the table is not registered to the table environment
>>> table_env.sql_query("SELECT * FROM %s" % table)

Parameters: query – The sql query string.
Returns: The result table.

unload_module(module_name: str)[source]¶

Unloads a Module with given name. ValidationException is thrown when there is no module with the given name.

Parameters: module_name – Name of the Module.

New in version 1.12.0.

use_catalog(catalog_name: str)[source]¶

Sets the current catalog to the given value. It also sets the default database to the catalog’s default one. See also use_database().

This is used during the resolution of object paths. Both the catalog and database are optional when referencing catalog objects such as tables, views etc. The algorithm looks for requested objects in following paths in that order:

[current-catalog].[current-database].[requested-path]
[current-catalog].[requested-path]
[requested-path]

Example:

Given structure with default catalog set to default_catalog and default database set to default_database.

root:
  |- default_catalog
      |- default_database
          |- tab1
      |- db1
          |- tab1
  |- cat1
      |- db1
          |- tab1

The following table describes resolved paths:

Requested path	Resolved path
tab1	default_catalog.default_database.tab1
db1.tab1	default_catalog.db1.tab1
cat1.db1.tab1	cat1.db1.tab1

Parameters: catalog_name – The name of the catalog to set as the current default catalog.
Throws: CatalogException thrown if a catalog with given name could not be set as the default one.

See also

use_database()

use_database(database_name: str)[source]¶

Sets the current default database. It has to exist in the current catalog. That path will be used as the default one when looking for unqualified object names.

This is used during the resolution of object paths. Both the catalog and database are optional when referencing catalog objects such as tables, views etc. The algorithm looks for requested objects in following paths in that order:

[current-catalog].[current-database].[requested-path]
[current-catalog].[requested-path]
[requested-path]

Example:

Given structure with default catalog set to default_catalog and default database set to default_database.

root:
  |- default_catalog
      |- default_database
          |- tab1
      |- db1
          |- tab1
  |- cat1
      |- db1
          |- tab1

The following table describes resolved paths:

Requested path	Resolved path
tab1	default_catalog.default_database.tab1
db1.tab1	default_catalog.db1.tab1
cat1.db1.tab1	cat1.db1.tab1

Throws: CatalogException thrown if the given catalog and database could not be set as the default ones.

See also

use_catalog()

Parameters: database_name – The name of the database to set as the current database.

use_modules(*module_names: str)[source]¶

Use an array of Module with given names. ValidationException is thrown when there is duplicate name or no module with the given name.

Parameters: module_names – Names of the modules to be used.

New in version 1.13.0.

class pyflink.table.TableFunction[source]¶

Bases: pyflink.table.udf.UserDefinedFunction

Base interface for user-defined table function. A user-defined table function creates zero, one, or multiple rows to a new row value.

New in version 1.11.0.

abstract eval(*args)[source]¶: Method which defines the logic of the table function.

class pyflink.table.TableResult(j_table_result)[source]¶

Bases: object

A TableResult is the representation of the statement execution result.

New in version 1.11.0.

collect() → pyflink.table.table_result.CloseableIterator[source]¶

Get the result contents as a closeable row iterator.

Note:

For SELECT operation, the job will not be finished unless all result data has been collected. So we should actively close the job to avoid resource leak through CloseableIterator#close method. Calling CloseableIterator#close method will cancel the job and release related resources.

For DML operation, Flink does not support getting the real affected row count now. So the affected row count is always -1 (unknown) for every sink, and them will be returned until the job is finished. Calling CloseableIterator#close method will cancel the job.

For other operations, no flink job will be submitted (get_job_client() is always empty), and the result is bounded. Do noting when calling CloseableIterator#close method.

Recommended code to call CloseableIterator#close method looks like:

>>> table_result = t_env.execute("select ...")
>>> with table_result.collect() as results:
>>>    for result in results:
>>>        ...

In order to fetch result to local, you can call either collect() and print(). But, they can not be called both on the same TableResult instance.

Returns: A CloseableIterator.

New in version 1.12.0.

get_job_client() → Optional[pyflink.common.job_client.JobClient][source]¶

For DML and DQL statement, return the JobClient which associates the submitted Flink job. For other statements (e.g. DDL, DCL) return empty.

Returns: The job client, optional.
Return type: pyflink.common.JobClient

New in version 1.11.0.

get_result_kind() → pyflink.table.result_kind.ResultKind[source]¶

Return the ResultKind which represents the result type.

For DDL operation and USE operation, the result kind is always SUCCESS. For other operations, the result kind is always SUCCESS_WITH_CONTENT.

Returns: The result kind.

New in version 1.11.0.

get_table_schema() → pyflink.table.table_schema.TableSchema[source]¶

Get the schema of result.

The schema of DDL, USE, EXPLAIN:

+-------------+-------------+----------+
| column name | column type | comments |
+-------------+-------------+----------+
| result      | STRING      |          |
+-------------+-------------+----------+

The schema of SHOW:

+---------------+-------------+----------+
|  column name  | column type | comments |
+---------------+-------------+----------+
| <object name> | STRING      |          |
+---------------+-------------+----------+
The column name of `SHOW CATALOGS` is "catalog name",
the column name of `SHOW DATABASES` is "database name",
the column name of `SHOW TABLES` is "table name",
the column name of `SHOW VIEWS` is "view name",
the column name of `SHOW FUNCTIONS` is "function name".

The schema of DESCRIBE:

+------------------+-------------+-------------------------------------------------+
| column name      | column type |                 comments                        |
+------------------+-------------+-------------------------------------------------+
| name             | STRING      | field name                                      |
+------------------+-------------+-------------------------------------------------+
| type             | STRING      | field type expressed as a String                |
+------------------+-------------+-------------------------------------------------+
| null             | BOOLEAN     | field nullability: true if a field is nullable, |
|                  |             | else false                                      |
+------------------+-------------+-------------------------------------------------+
| key              | BOOLEAN     | key constraint: 'PRI' for primary keys,         |
|                  |             | 'UNQ' for unique keys, else null                |
+------------------+-------------+-------------------------------------------------+
| computed column  | STRING      | computed column: string expression              |
|                  |             | if a field is computed column, else null        |
+------------------+-------------+-------------------------------------------------+
| watermark        | STRING      | watermark: string expression if a field is      |
|                  |             | watermark, else null                            |
+------------------+-------------+-------------------------------------------------+

The schema of INSERT: (one column per one sink)

+----------------------------+-------------+-----------------------+
| column name                | column type | comments              |
+----------------------------+-------------+-----------------------+
| (name of the insert table) | BIGINT      | the insert table name |
+----------------------------+-------------+-----------------------+

The schema of SELECT is the selected field names and types.

Returns: The schema of result.
Return type: pyflink.table.TableSchema

New in version 1.11.0.

print()[source]¶

Print the result contents as tableau form to client console.

This method has slightly different behaviors under different checkpointing settings.

For batch jobs or streaming jobs without checkpointing, this method has neither exactly-once nor at-least-once guarantee. Query results are immediately accessible by the clients once they’re produced, but exceptions will be thrown when the job fails and restarts.

For streaming jobs with exactly-once checkpointing, this method guarantees an end-to-end exactly-once record delivery. A result will be accessible by clients only after its corresponding checkpoint completes.

For streaming jobs with at-least-once checkpointing, this method guarantees an end-to-end at-least-once record delivery. Query results are immediately accessible by the clients once they’re produced, but it is possible for the same result to be delivered multiple times.

New in version 1.11.0.

wait(timeout_ms: int = None)[source]¶

Wait if necessary for at most the given time (milliseconds) for the data to be ready.

For a select operation, this method will wait until the first row can be accessed locally. For an insert operation, this method will wait for the job to finish, because the result contains only one row. For other operations, this method will return immediately, because the result is already available locally.

New in version 1.12.0.

class pyflink.table.TableSchema(field_names: List[str] = None, data_types: List[pyflink.table.types.DataType] = None, j_table_schema=None)[source]¶

Bases: object

A table schema that represents a table’s structure with field names and data types.

class Builder[source]¶

Bases: object

Builder for creating a TableSchema.

build() → pyflink.table.table_schema.TableSchema[source]¶

Returns a TableSchema instance.

Returns: The TableSchema instance.

field(name: str, data_type: pyflink.table.types.DataType) → pyflink.table.table_schema.TableSchema.Builder[source]¶

Add a field with name and data type.

The call order of this method determines the order of fields in the schema.

Parameters

name – The field name.
data_type – The field data type.

Returns

This object.

classmethod builder()[source]¶

copy() → pyflink.table.table_schema.TableSchema[source]¶

Returns a deep copy of the table schema.

Returns: A deep copy of the table schema.

get_field_count() → int[source]¶

Returns the number of fields.

Returns: The number of fields.

get_field_data_type(field: Union[int, str]) → Optional[pyflink.table.types.DataType][source]¶

Returns the specified data type for the given field index or field name.

Parameters: field – The index of the field or the name of the field.
Returns: The data type of the specified field.

get_field_data_types() → List[pyflink.table.types.DataType][source]¶

Returns all field data types as a list.

Returns: A list of all field data types.

get_field_name(field_index: int) → Optional[str][source]¶

Returns the specified name for the given field index.

Parameters: field_index – The index of the field.
Returns: The field name.

get_field_names() → List[str][source]¶

Returns all field names as a list.

Returns: The list of all field names.

to_row_data_type() → pyflink.table.types.RowType[source]¶

Converts a table schema into a (nested) data type describing a pyflink.table.types.DataTypes.ROW().

Returns: The row data type.

class pyflink.table.TableSink(j_table_sink)[source]¶

Bases: object

A TableSink specifies how to emit a table to an external system or location.

class pyflink.table.TableSource(j_table_source)[source]¶

Bases: object

Defines a table from an external system or location.

class pyflink.table.UserDefinedType(nullable=True)[source]¶

Bases: pyflink.table.types.DataType

User-defined type (UDT).

Note

WARN: Flink Internal Use Only

deserialize(datum)[source]¶: Converts a SQL datum into a user-type object.

from_sql_type(obj)[source]¶: Converts an internal SQL object into a native Python object.

classmethod java_udt()[source]¶: The class name of the paired Java UDT (could be ‘’, if there is no corresponding one).

classmethod module()[source]¶: The Python module of the UDT.

need_conversion()[source]¶

Does this type need to conversion between Python object and internal SQL object.

This is used to avoid the unnecessary conversion for ArrayType/MultisetType/MapType/RowType.

serialize(obj)[source]¶: Converts the a user-type object into a SQL datum.

classmethod sql_type()[source]¶: Underlying SQL storage type for this UDT.

to_sql_type(obj)[source]¶: Converts a Python object into an internal SQL object.

classmethod type_name()[source]¶

class pyflink.table.WindowGroupedTable(java_window_grouped_table, t_env)[source]¶

Bases: object

A table that has been windowed and grouped for GroupWindow.

aggregate(func: Union[pyflink.table.expression.Expression, pyflink.table.udf.UserDefinedAggregateFunctionWrapper]) → pyflink.table.table.AggregatedTable[source]¶

Performs an aggregate operation on a window grouped table. You have to close the aggregate with a select statement.

Example:

>>> agg = udaf(lambda a: (a.mean(), a.max()),
...               result_type=DataTypes.ROW(
...                   [DataTypes.FIELD("a", DataTypes.FLOAT()),
...                    DataTypes.FIELD("b", DataTypes.INT())]),
...               func_type="pandas")
>>> window_grouped_table.group_by(col("w"))             ...     .aggregate(agg(col('b')))             ...     .alias("c", "d")             ...     .select(col('c'), col('d'))
>>> # take all the columns as inputs
>>> # pd is a Pandas.DataFrame
>>> agg_row = udaf(lambda pd: (pd.a.mean(), pd.b.max()),
...               result_type=DataTypes.ROW(
...                   [DataTypes.FIELD("a", DataTypes.FLOAT()),
...                    DataTypes.FIELD("b", DataTypes.INT())]),
...               func_type="pandas")
>>> window_grouped_table.group_by(col("w"), col("a")).aggregate(agg_row)

Parameters: func – user-defined aggregate function.
Returns: The result table.

New in version 1.13.0.

select(*fields: pyflink.table.expression.Expression) → pyflink.table.table.Table[source]¶

Performs a selection operation on a window grouped table. Similar to an SQL SELECT statement. The field expressions can contain complex expressions and aggregations.

Example:

>>> window_grouped_table.select(col('key'),
...                             col('window').start,
...                             col('value').avg.alias('valavg'))

Parameters: fields – Expression string.
Returns: The result table.

class pyflink.table.WriteMode[source]¶

Bases: object

NO_OVERWRITE = 0¶

OVERWRITE = 1¶

pyflink.table.expressions module¶

pyflink.table.expressions.CURRENT_ROW: Expression = <pyflink.table.expression.Expression object>¶: Offset constant to be used in the following clause of Over windows. Use this for setting the upper bound of the window to the sort key of the current row, i.e., all rows with the same sort key as the current row are included in the window.

New in version 1.12.0.

pyflink.table.expressions.UNBOUNDED_RANGE: Expression = <pyflink.table.expression.Expression object>¶: Offset constant to be used in the following clause of Over windows. Use this for setting the upper bound of the window to the current row.

New in version 1.12.0.

pyflink.table.expressions.UNBOUNDED_ROW: Expression = <pyflink.table.expression.Expression object>¶: Offset constant to be used in the preceding clause of unbounded Over windows. Use this constant for a row-count interval. Unbounded over windows start with the first row of a partition.

New in version 1.12.0.

pyflink.table.expressions.and_(predicate0: Union[bool, pyflink.table.expression.Expression[bool]], predicate1: Union[bool, pyflink.table.expression.Expression[bool]], *predicates: Union[bool, pyflink.table.expression.Expression[bool]]) → pyflink.table.expression.Expression[bool][source]¶: Boolean AND in three-valued logic.

New in version 1.12.0.

pyflink.table.expressions.array(head, *tail) → pyflink.table.expression.Expression[source]¶

Creates an array of literals.

Example:

>>> tab.select(array(1, 2, 3))

New in version 1.12.0.

pyflink.table.expressions.atan2(y, x) → pyflink.table.expression.Expression[float][source]¶: Calculates the arc tangent of a given coordinate.

New in version 1.12.0.

pyflink.table.expressions.call(f: Union[str, pyflink.table.udf.UserDefinedFunctionWrapper], *args) → pyflink.table.expression.Expression[source]¶

The first parameter f could be a str or a Python user-defined function.

When it is str, this is a call to a function that will be looked up in a catalog. There are two kinds of functions:

System functions - which are identified with one part names

Catalog functions - which are identified always with three parts names
(catalog, database, function)

Moreover each function can either be a temporary function or permanent one (which is stored in an external catalog).

Based on that two properties the resolution order for looking up a function based on the provided function_name is following:

Temporary system function

System function

Temporary catalog function

Catalog function

Parameters

f – the path of the function or the Python user-defined function.
args – parameters of the user-defined function.

New in version 1.12.0.

pyflink.table.expressions.call_sql(sql_expression: str) → pyflink.table.expression.Expression[source]¶

A call to a SQL expression.

The given string is parsed and translated into a Table API expression during planning. Only the translated expression is evaluated during runtime.

Note: Currently, calls are limited to simple scalar expressions. Calls to aggregate or table-valued functions are not supported. Sub-queries are also not allowed.

Parameters: sql_expression – SQL expression to be translated

New in version 1.12.0.

pyflink.table.expressions.col(name: str) → pyflink.table.expression.Expression[source]¶

Creates an expression which refers to a table’s column.

Example:

>>> tab.select(col("key"), col("value"))

Parameters: name – the field name to refer to

New in version 1.12.0.

pyflink.table.expressions.concat(first: Union[str, pyflink.table.expression.Expression[str]], *others: Union[str, pyflink.table.expression.Expression[str]]) → pyflink.table.expression.Expression[str][source]¶: Returns the string that results from concatenating the arguments. Returns NULL if any argument is NULL.

New in version 1.12.0.

pyflink.table.expressions.concat_ws(separator: Union[str, pyflink.table.expression.Expression[str]], first: Union[str, pyflink.table.expression.Expression[str]], *others: Union[str, pyflink.table.expression.Expression[str]]) → pyflink.table.expression.Expression[str][source]¶: Returns the string that results from concatenating the arguments and separator. Returns NULL If the separator is NULL.

Note

this function does not skip empty strings. However, it does skip any NULL values after the separator argument.

New in version 1.12.0.

pyflink.table.expressions.current_database() → pyflink.table.expression.Expression[source]¶: Returns the current database

New in version 1.12.0.

pyflink.table.expressions.current_date() → pyflink.table.expression.Expression[source]¶: Returns the current SQL date in local time zone.

New in version 1.12.0.

pyflink.table.expressions.current_time() → pyflink.table.expression.Expression[source]¶: Returns the current SQL time in local time zone.

New in version 1.12.0.

pyflink.table.expressions.current_timestamp() → pyflink.table.expression.Expression[source]¶: Returns the current SQL timestamp in local time zone, the return type of this expression is TIMESTAMP_LTZ.

New in version 1.12.0.

pyflink.table.expressions.current_watermark(rowtimeAttribute) → pyflink.table.expression.Expression[source]¶

Returns the current watermark for the given rowtime attribute, or NULL if no common watermark of all upstream operations is available at the current operation in the pipeline.

The function returns the watermark with the same type as the rowtime attribute, but with an adjusted precision of 3. For example, if the rowtime attribute is TIMESTAMP_LTZ(9), the function will return TIMESTAMP_LTZ(3).

If no watermark has been emitted yet, the function will return NULL. Users must take care of this when comparing against it, e.g. in order to filter out late data you can use

WHERE CURRENT_WATERMARK(ts) IS NULL OR ts > CURRENT_WATERMARK(ts)

New in version 1.12.0.

pyflink.table.expressions.date_format(timestamp, format) → pyflink.table.expression.Expression[source]¶

Formats a timestamp as a string using a specified format. The format must be compatible with MySQL’s date formatting syntax as used by the date_parse function.

For example date_format(col(“time”), “%Y, %d %M”) results in strings formatted as “2017, 05 May”.

Parameters

timestamp – The timestamp to format as string.
format – The format of the string.

Returns

The formatted timestamp as string.

New in version 1.12.0.

pyflink.table.expressions.e() → pyflink.table.expression.Expression[float][source]¶: Returns a value that is closer than any other value to e.

New in version 1.12.0.

pyflink.table.expressions.if_then_else(condition: Union[bool, pyflink.table.expression.Expression[bool]], if_true, if_false) → pyflink.table.expression.Expression[source]¶

Ternary conditional operator that decides which of two other expressions should be evaluated based on a evaluated boolean condition.

e.g. if_then_else(col(“f0”) > 5, “A”, “B”) leads to “A”

Parameters

condition – condition boolean condition
if_true – expression to be evaluated if condition holds
if_false – expression to be evaluated if condition does not hold

New in version 1.12.0.

pyflink.table.expressions.json_array(on_null: pyflink.table.expression.JsonOnNull = <JsonOnNull.ABSENT: 1>, *args) → pyflink.table.expression.Expression[source]¶

Builds a JSON array string from a list of values.

This function returns a JSON string. The values can be arbitrary expressions. The on_null behavior defines how to treat NULL values.

Elements which are created from another JSON construction function call (json_object, json_array) are inserted directly rather than as a string. This allows building nested JSON structures.

Examples:

>>> json_array() # '[]'
>>> json_array(JsonOnNull.NULL, 1, "2") # '[1,"2"]'

>>> # Expressions as values
>>> json_array(JsonOnNull.NULL, col("orderId"))

>>> json_array(JsonOnNull.NULL, null_of(DataTypes.STRING()))   # '[null]'
>>> json_array(JsonOnNull.ABSENT, null_of(DataTypes.STRING())) # '[]'

>>> json_array(JsonOnNull.NULL, json_array(JsonOnNull.NULL, 1)) # '[[1]]'

See also

json_object()

New in version 1.12.0.

pyflink.table.expressions.json_array_agg(on_null: pyflink.table.expression.JsonOnNull, item_expr) → pyflink.table.expression.Expression[source]¶

Builds a JSON object string by aggregating items into an array.

Item expressions can be arbitrary, including other JSON functions. If a value is NULL, the on_null behavior defines what to do.

This function is currently not supported in OVER windows, unbounded session windows, or hop windows.

Examples:

>>> # '["Apple","Banana","Orange"]'
>>> orders.select(json_array_agg(JsonOnNull.NULL, col("product")))

New in version 1.12.0.

pyflink.table.expressions.json_object(on_null: pyflink.table.expression.JsonOnNull = <JsonOnNull.NULL: (0, )>, *args) → pyflink.table.expression.Expression[source]¶

Builds a JSON object string from a list of key-value pairs.

args is an even-numbered list of alternating key/value pairs. Note that keys must be non-NULL string literals, while values may be arbitrary expressions.

This function returns a JSON string. The on_null behavior defines how to treat NULL values.

Values which are created from another JSON construction function call (json_object, json_array) are inserted directly rather than as a string. This allows building nested JSON structures.

Examples:

>>> json_object() # '{}'
>>> json_object(JsonOnNull.NULL, "K1", "V1", "K2", "V2") # '{"K1":"V1","K2":"V2"}'

>>> # Expressions as values
>>> json_object(JsonOnNull.NULL, "orderNo", col("orderId"))

>>> json_object(JsonOnNull.NULL, "K1", null_of(DataTypes.STRING()))   # '{"K1":null}'
>>> json_object(JsonOnNull.ABSENT, "K1", null_of(DataTypes.STRING())) # '{}'

>>> # '{"K1":{"K2":"V"}}'
>>> json_object(JsonOnNull.NULL, "K1", json_object(JsonOnNull.NULL, "K2", "V"))

See also

json_array()

New in version 1.12.0.

pyflink.table.expressions.json_object_agg(on_null: pyflink.table.expression.JsonOnNull, key_expr: Union[str, pyflink.table.expression.Expression[str]], value_expr) → pyflink.table.expression.Expression[source]¶

Builds a JSON object string by aggregating key-value expressions into a single JSON object.

The key expression must return a non-nullable character string. Value expressions can be arbitrary, including other JSON functions. If a value is NULL, the on_null behavior defines what to do.

Note that keys must be unique. If a key occurs multiple times, an error will be thrown.

This function is currently not supported in OVER windows.

Examples:

>>> # '{"Apple":2,"Banana":17,"Orange":0}'
>>> orders.select(json_object_agg(JsonOnNull.NULL, col("product"), col("cnt")))

New in version 1.12.0.

pyflink.table.expressions.json_string(value) → pyflink.table.expression.Expression[source]¶

Serializes a value into JSON.

This function returns a JSON string containing the serialized value. If the value is NULL, the function returns NULL.

Examples:

>>> json_string(null_of(DataTypes.INT())) # None

>>> json_string(1)               # '1'
>>> json_string(True)            # 'true'
>>> json_string("Hello, World!") # '"Hello, World!"'
>>> json_string([1, 2])          # '[1,2]'

New in version 1.12.0.

pyflink.table.expressions.lit(v, data_type: pyflink.table.types.DataType = None) → pyflink.table.expression.Expression[source]¶

Creates a SQL literal.

The data type is derived from the object’s class and its value. For example, lit(12) leads to INT, lit(“abc”) leads to CHAR(3).

Example:

>>> tab.select(col("key"), lit("abc"))

New in version 1.12.0.

pyflink.table.expressions.local_time() → pyflink.table.expression.Expression[source]¶: Returns the current SQL time in local time zone.

New in version 1.12.0.

pyflink.table.expressions.local_timestamp() → pyflink.table.expression.Expression[source]¶: Returns the current SQL timestamp in local time zone, the return type of this expression s TIMESTAMP.

New in version 1.12.0.

pyflink.table.expressions.log(v, base=None) → pyflink.table.expression.Expression[float][source]¶: If base is specified, calculates the logarithm of the given value to the given base. Otherwise, calculates the natural logarithm of the given value.

New in version 1.12.0.

pyflink.table.expressions.map_(key, value, *tail) → pyflink.table.expression.Expression[source]¶

Creates a map of expressions.

Example:

>>> tab.select(
>>>     map_(
>>>         "key1", 1,
>>>         "key2", 2,
>>>         "key3", 3
>>>     ))

Note

keys and values should have the same types for all entries.

New in version 1.12.0.

pyflink.table.expressions.negative(v) → pyflink.table.expression.Expression[source]¶: Returns negative numeric.

New in version 1.12.0.

pyflink.table.expressions.not_(expression: pyflink.table.expression.Expression[bool]) → pyflink.table.expression.Expression[bool][source]¶

Inverts a given boolean expression.

This method supports a three-valued logic by preserving NULL. This means if the input expression is NULL, the result will also be NULL.

The resulting type is nullable if and only if the input type is nullable.

Examples:

>>> not_(lit(True)) # False
>>> not_(lit(False)) # True
>>> not_(lit(None, DataTypes.BOOLEAN())) # None

New in version 1.12.0.

pyflink.table.expressions.null_of(data_type: pyflink.table.types.DataType) → pyflink.table.expression.Expression[source]¶: Returns a null literal value of a given data type.

New in version 1.12.0.

pyflink.table.expressions.or_(predicate0: Union[bool, pyflink.table.expression.Expression[bool]], predicate1: Union[bool, pyflink.table.expression.Expression[bool]], *predicates: Union[bool, pyflink.table.expression.Expression[bool]]) → pyflink.table.expression.Expression[bool][source]¶: Boolean OR in three-valued logic.

New in version 1.12.0.

pyflink.table.expressions.pi() → pyflink.table.expression.Expression[float][source]¶: Returns a value that is closer than any other value to pi.

New in version 1.12.0.

pyflink.table.expressions.rand(seed: Union[int, pyflink.table.expression.Expression[int]] = None) → pyflink.table.expression.Expression[float][source]¶: Returns a pseudorandom double value between 0.0 (inclusive) and 1.0 (exclusive) with a initial seed if specified. Two rand() functions will return identical sequences of numbers if they have same initial seed.

New in version 1.12.0.

pyflink.table.expressions.rand_integer(bound: Union[int, pyflink.table.expression.Expression[int]], seed: Union[int, pyflink.table.expression.Expression[int]] = None) → pyflink.table.expression.Expression[source]¶: Returns a pseudorandom integer value between 0 (inclusive) and the specified value (exclusive) with a initial seed if specified. Two rand_integer() functions will return identical sequences of numbers if they have same initial seed and same bound.

New in version 1.12.0.

pyflink.table.expressions.range_(start: Union[str, int], end: Union[str, int]) → pyflink.table.expression.Expression[source]¶

Indicates a range from ‘start’ to ‘end’, which can be used in columns selection.

Example:

>>> tab.select(with_columns(range_('b', 'c')))

See also

with_columns()

New in version 1.12.0.

pyflink.table.expressions.row(head, *tail) → pyflink.table.expression.Expression[source]¶

Creates a row of expressions.

Example:

>>> tab.select(row("key1", 1))

New in version 1.12.0.

pyflink.table.expressions.row_interval(rows: int) → pyflink.table.expression.Expression[source]¶

Creates an interval of rows.

Example:

>>> tab.window(Over
>>>         .partition_by(col('a'))
>>>         .order_by(col('proctime'))
>>>         .preceding(row_interval(4))
>>>         .following(CURRENT_ROW)
>>>         .alias('w'))

Parameters: rows – the number of rows

New in version 1.12.0.

pyflink.table.expressions.source_watermark() → pyflink.table.expression.Expression[source]¶

Source watermark declaration for schema.

This is a marker function that doesn’t have concrete runtime implementation. It can only be used as a single expression for watermark strategies in schema declarations. The declaration will be pushed down into a table source that implements the SupportsSourceWatermark interface. The source will emit system-defined watermarks afterwards.

Please check the documentation whether the connector supports source watermarks.

New in version 1.12.0.

pyflink.table.expressions.temporal_overlaps(left_time_point, left_temporal, right_time_point, right_temporal) → pyflink.table.expression.Expression[source]¶

Determines whether two anchored time intervals overlap. Time point and temporal are transformed into a range defined by two time points (start, end). The function evaluates left_end >= right_start && right_end >= left_start.

e.g.

temporal_overlaps(: lit(“2:55:00”).to_time, lit(1).hours, lit(“3:30:00”).to_time, lit(2).hours) leads to true.

Parameters

left_time_point – The left time point
left_temporal – The time interval from the left time point
right_time_point – The right time point
right_temporal – The time interval from the right time point

Returns

An expression which indicates whether two anchored time intervals overlap.

New in version 1.12.0.

pyflink.table.expressions.timestamp_diff(time_point_unit: pyflink.table.expression.TimePointUnit, time_point1, time_point2) → pyflink.table.expression.Expression[source]¶

Returns the (signed) number of TimePointUnit between time_point1 and time_point2.

For example, timestamp_diff(TimePointUnit.DAY, lit(“2016-06-15”).to_date, lit(“2016-06-18”).to_date leads to 3.

Parameters

time_point_unit – The unit to compute diff.
time_point1 – The first point in time.
time_point2 – The second point in time.

Returns

The number of intervals as integer value.

New in version 1.12.0.

pyflink.table.expressions.uuid() → pyflink.table.expression.Expression[str][source]¶: Returns an UUID (Universally Unique Identifier) string (e.g., “3d3c68f7-f608-473f-b60c-b0c44ad4cc4e”) according to RFC 4122 type 4 (pseudo randomly generated) UUID. The UUID is generated using a cryptographically strong pseudo random number generator.

New in version 1.12.0.

pyflink.table.expressions.with_columns(head, *tails) → pyflink.table.expression.Expression[source]¶

Creates an expression that selects a range of columns. It can be used wherever an array of expression is accepted such as function calls, projections, or groupings.

A range can either be index-based or name-based. Indices start at 1 and boundaries are inclusive.

e.g. with_columns(range_(“b”, “c”)) or with_columns(col(“*”))

See also

range_(), without_columns()

New in version 1.12.0.

pyflink.table.expressions.without_columns(head, *tails) → pyflink.table.expression.Expression[source]¶

Creates an expression that selects all columns except for the given range of columns. It can be used wherever an array of expression is accepted such as function calls, projections, or groupings.

A range can either be index-based or name-based. Indices start at 1 and boundaries are inclusive.

e.g. without_columns(range_(“b”, “c”)) or without_columns(col(“c”))

See also

range_(), with_columns()

New in version 1.12.0.

pyflink.table.window module¶

class pyflink.table.window.GroupWindow(java_window)[source]¶

A group window specification.

Group windows group rows based on time or row-count intervals and is therefore essentially a special type of groupBy. Just like groupBy, group windows allow to compute aggregates on groups of elements.

Infinite streaming tables can only be grouped into time or row intervals. Hence window grouping is required to apply aggregations on streaming tables.

For finite batch tables, group windows provide shortcuts for time-based groupBy.

class pyflink.table.window.Over[source]¶

Helper class for creating an over window. Similar to SQL, over window aggregates compute an aggregate for each input row over a range of its neighboring rows.

Over-windows for batch tables are currently not supported.

Example:

>>> from pyflink.table.expressions import col, UNBOUNDED_RANGE
>>> Over.partition_by(col("a")) \
...     .order_by(col("rowtime")) \
...     .preceding(UNBOUNDED_RANGE) \
...     .alias("w")

classmethod order_by(order_by: pyflink.table.expression.Expression) → pyflink.table.window.OverWindowPartitionedOrdered[source]¶

Specifies the time attribute on which rows are ordered.

For streaming tables, reference a rowtime or proctime time attribute here to specify the time mode.

Parameters: order_by – Field reference.
Returns: An over window with defined order.

classmethod partition_by(*partition_by: pyflink.table.expression.Expression) → pyflink.table.window.OverWindowPartitioned[source]¶

Partitions the elements on some partition keys.

Each partition is individually sorted and aggregate functions are applied to each partition separately.

Parameters: partition_by – List of field references.
Returns: An over window with defined partitioning.

class pyflink.table.window.OverWindow(java_over_window)[source]¶

An over window specification.

Similar to SQL, over window aggregates compute an aggregate for each input row over a range of its neighboring rows.

class pyflink.table.window.Session[source]¶

Helper class for creating a session window. The boundary of session windows are defined by intervals of inactivity, i.e., a session window is closes if no event appears for a defined gap period.

Example:

>>> from pyflink.table.expressions import col, lit
>>> Session.with_gap(lit(10).minutes) \
...        .on(col("rowtime")) \
...        .alias("w")

classmethod with_gap(gap: pyflink.table.expression.Expression) → pyflink.table.window.SessionWithGap[source]¶

Creates a session window. The boundary of session windows are defined by intervals of inactivity, i.e., a session window is closes if no event appears for a defined gap period.

Parameters: gap – Specifies how long (as interval of milliseconds) to wait for new data before closing the session window.
Returns: A partially defined session window.

class pyflink.table.window.Slide[source]¶

Helper class for creating a sliding window. Sliding windows have a fixed size and slide by a specified slide interval. If the slide interval is smaller than the window size, sliding windows are overlapping. Thus, an element can be assigned to multiple windows.

For example, a sliding window of size 15 minutes with 5 minutes sliding interval groups elements of 15 minutes and evaluates every five minutes. Each element is contained in three consecutive window evaluations.

Example:

>>> from pyflink.table.expressions import col, lit
>>> Slide.over(lit(10).minutes) \
...      .every(lit(5).minutes) \
...      .on(col("rowtime")) \
...      .alias("w")

classmethod over(size: pyflink.table.expression.Expression) → pyflink.table.window.SlideWithSize[source]¶

Creates a sliding window. Sliding windows have a fixed size and slide by a specified slide interval. If the slide interval is smaller than the window size, sliding windows are overlapping. Thus, an element can be assigned to multiple windows.

For example, a sliding window of size 15 minutes with 5 minutes sliding interval groups elements of 15 minutes and evaluates every five minutes. Each element is contained in three consecutive window evaluations.

Parameters: size – The size of the window as time or row-count interval.
Returns: A partially specified sliding window.

class pyflink.table.window.Tumble[source]¶

Helper class for creating a tumbling window. Tumbling windows are consecutive, non-overlapping windows of a specified fixed length. For example, a tumbling window of 5 minutes size groups elements in 5 minutes intervals.

Example:

>>> from pyflink.table.expressions import col, lit
>>> Tumble.over(lit(10).minutes) \
...       .on(col("rowtime")) \
...       .alias("w")

classmethod over(size: pyflink.table.expression.Expression) → pyflink.table.window.TumbleWithSize[source]¶

Creates a tumbling window. Tumbling windows are fixed-size, consecutive, non-overlapping windows of a specified fixed length. For example, a tumbling window of 5 minutes size groups elements in 5 minutes intervals.

Parameters: size – The size of the window as time or row-count interval.
Returns: A partially defined tumbling window.

pyflink.table.descriptors module¶

class pyflink.table.descriptors.Rowtime[source]¶

Rowtime descriptor for describing an event time attribute in the schema.

timestamps_from_extractor(extractor: str) → pyflink.table.descriptors.Rowtime [source]¶

Sets a custom timestamp extractor to be used for the rowtime attribute.

Parameters: extractor – The java fully-qualified class name of the TimestampExtractor to extract the rowtime attribute from the physical type. The TimestampExtractor must have a public no-argument constructor and can be founded by in current Java classloader.
Returns: This rowtime descriptor.

timestamps_from_field(field_name: str)[source]¶

Sets a built-in timestamp extractor that converts an existing LONG or TIMESTAMP field into the rowtime attribute.

Parameters: field_name – The field to convert into a rowtime attribute.
Returns: This rowtime descriptor.

timestamps_from_source() → pyflink.table.descriptors.Rowtime [source]¶

Sets a built-in timestamp extractor that converts the assigned timestamps from a DataStream API record into the rowtime attribute and thus preserves the assigned timestamps from the source.

Note

This extractor only works in streaming environments.

Returns: This rowtime descriptor.

watermarks_from_source() → pyflink.table.descriptors.Rowtime [source]¶

Sets a built-in watermark strategy which indicates the watermarks should be preserved from the underlying DataStream API and thus preserves the assigned watermarks from the source.

Returns: This rowtime descriptor.

watermarks_from_strategy(strategy: str) → pyflink.table.descriptors.Rowtime [source]¶

Sets a custom watermark strategy to be used for the rowtime attribute.

Parameters: strategy – The java fully-qualified class name of the WatermarkStrategy. The WatermarkStrategy must have a public no-argument constructor and can be founded by in current Java classloader.
Returns: This rowtime descriptor.

watermarks_periodic_ascending() → pyflink.table.descriptors.Rowtime [source]¶

Sets a built-in watermark strategy for ascending rowtime attributes.

Emits a watermark of the maximum observed timestamp so far minus 1. Rows that have a timestamp equal to the max timestamp are not late.

Returns: This rowtime descriptor.

watermarks_periodic_bounded(delay: int) → pyflink.table.descriptors.Rowtime [source]¶

Sets a built-in watermark strategy for rowtime attributes which are out-of-order by a bounded time interval.

Emits watermarks which are the maximum observed timestamp minus the specified delay.

Parameters: delay – Delay in milliseconds.
Returns: This rowtime descriptor.

class pyflink.table.descriptors.Schema(schema=None, fields=None, rowtime=None)[source]¶

Describes a schema of a table.

Note

Field names are matched by the exact name by default (case sensitive).

field(field_name: str, field_type: Union[pyflink.table.types.DataType, str]) → pyflink.table.descriptors.Schema [source]¶

Adds a field with the field name and the data type or type string. Required. This method can be called multiple times. The call order of this method defines also the order of the fields in a row. Here is a document that introduces the type strings: https://nightlies.apache.org/flink/flink-docs-stable/dev/table/connect.html#type-strings

Parameters

field_name – The field name.
field_type – The data type or type string of the field.

Returns

This schema object.

fields(fields: Dict[str, Union[pyflink.table.types.DataType, str]]) → pyflink.table.descriptors.Schema [source]¶

Adds a set of fields with the field name and the data type or type string stored in a list.

Parameters: fields – Dict of fields with the field name and the data type or type string stored. E.g, [(‘int_field’, DataTypes.INT()), (‘string_field’, DataTypes.STRING())].
Returns: This schema object.

New in version 1.11.0.

from_origin_field(origin_field_name: str) → pyflink.table.descriptors.Schema [source]¶

Specifies the origin of the previously defined field. The origin field is defined by a connector or format.

E.g. field(“myString”, Types.STRING).from_origin_field(“CSV_MY_STRING”)

Note

Field names are matched by the exact name by default (case sensitive).

Parameters: origin_field_name – The origin field name.
Returns: This schema object.

proctime() → pyflink.table.descriptors.Schema [source]¶

Specifies the previously defined field as a processing-time attribute.

E.g. field(“proctime”, Types.SQL_TIMESTAMP_LTZ).proctime()

Returns: This schema object.

rowtime(rowtime: pyflink.table.descriptors.Rowtime) → pyflink.table.descriptors.Schema [source]¶

Specifies the previously defined field as an event-time attribute.

E.g. field(“rowtime”, Types.SQL_TIMESTAMP).rowtime(…)

Parameters: rowtime – A RowTime.
Returns: This schema object.

schema(table_schema: pyflink.table.table_schema.TableSchema) → pyflink.table.descriptors.Schema [source]¶

Sets the schema with field names and the types. Required.

This method overwrites existing fields added with field().

Parameters: table_schema – The TableSchema object.
Returns: This schema object.

pyflink.table.catalog module¶

class pyflink.table.catalog.Catalog(j_catalog)[source]¶

Catalog is responsible for reading and writing metadata such as database/table/views/UDFs from a registered catalog. It connects a registered catalog and Flink’s Table API.

alter_database(name: str, new_database: pyflink.table.catalog.CatalogDatabase, ignore_if_not_exists: bool)[source]¶

Modify an existing database.

Parameters

name – Name of the database to be modified.
new_database – The new database CatalogDatabase definition.
ignore_if_not_exists – Flag to specify behavior when the given database does not exist: if set to false, throw an exception, if set to true, do nothing.

Raise

CatalogException in case of any runtime exception. DatabaseNotExistException if the given database does not exist.

alter_function(function_path: pyflink.table.catalog.ObjectPath, new_function: pyflink.table.catalog.CatalogFunction, ignore_if_not_exists: bool)[source]¶

Modify an existing function.

Parameters

function_path – Path ObjectPath of the function.
new_function – The function CatalogFunction to be modified.
ignore_if_not_exists – Flag to specify behavior if the function does not exist: if set to false, throw an exception if set to true, nothing happens

Raise

CatalogException in case of any runtime exception. FunctionNotExistException if the function does not exist.

alter_partition(table_path: pyflink.table.catalog.ObjectPath, partition_spec: pyflink.table.catalog.CatalogPartitionSpec, new_partition: pyflink.table.catalog.CatalogPartition, ignore_if_not_exists: bool)[source]¶

Alter a partition.

Parameters

table_path – Path ObjectPath of the table.
partition_spec – Partition spec CatalogPartitionSpec of the partition to alter.
new_partition – New partition CatalogPartition to replace the old one.
ignore_if_not_exists – Flag to specify behavior if the database does not exist: if set to false, throw an exception, if set to true, nothing happens.

Raise

CatalogException in case of any runtime exception. PartitionNotExistException thrown if the target partition does not exist.

alter_partition_column_statistics(table_path: pyflink.table.catalog.ObjectPath, partition_spec: pyflink.table.catalog.CatalogPartitionSpec, column_statistics: pyflink.table.catalog.CatalogColumnStatistics, ignore_if_not_exists: bool)[source]¶

Update the column statistics of a table partition.

Parameters

table_path – Path ObjectPath of the table.
partition_spec – Partition spec CatalogPartitionSpec of the partition.
column_statistics – New column statistics CatalogColumnStatistics to update.
ignore_if_not_exists – Flag to specify behavior if the partition does not exist: if set to false, throw an exception, if set to true, nothing happens.

Raise

CatalogException in case of any runtime exception. PartitionNotExistException if the partition does not exist.

alter_partition_statistics(table_path: pyflink.table.catalog.ObjectPath, partition_spec: pyflink.table.catalog.CatalogPartitionSpec, partition_statistics: pyflink.table.catalog.CatalogTableStatistics, ignore_if_not_exists: bool)[source]¶

Update the statistics of a table partition.

Parameters

table_path – Path ObjectPath of the table.
partition_spec – Partition spec CatalogPartitionSpec of the partition.
partition_statistics – New statistics CatalogTableStatistics to update.
ignore_if_not_exists – Flag to specify behavior if the partition does not exist: if set to false, throw an exception, if set to true, nothing happens.

Raise

CatalogException in case of any runtime exception. PartitionNotExistException if the partition does not exist.

alter_table(table_path: pyflink.table.catalog.ObjectPath, new_table: pyflink.table.catalog.CatalogBaseTable, ignore_if_not_exists)[source]¶

Modify an existing table or view. Note that the new and old CatalogBaseTable must be of the same type. For example, this doesn’t allow alter a regular table to partitioned table, or alter a view to a table, and vice versa.

Parameters

table_path – Path ObjectPath of the table or view to be modified.
new_table – The new table definition CatalogBaseTable.
ignore_if_not_exists – Flag to specify behavior when the table or view does not exist: if set to false, throw an exception, if set to true, do nothing.

Raise

CatalogException in case of any runtime exception. TableNotExistException if the table does not exist.

alter_table_column_statistics(table_path: pyflink.table.catalog.ObjectPath, column_statistics: pyflink.table.catalog.CatalogColumnStatistics, ignore_if_not_exists: bool)[source]¶

Update the column statistics of a table.

Parameters

table_path – Path ObjectPath of the table.
column_statistics – New column statistics CatalogColumnStatistics to update.
ignore_if_not_exists – Flag to specify behavior if the column does not exist: if set to false, throw an exception, if set to true, nothing happens.

Raise

CatalogException in case of any runtime exception. TableNotExistException if the table does not exist in the catalog.

alter_table_statistics(table_path: pyflink.table.catalog.ObjectPath, table_statistics: pyflink.table.catalog.CatalogTableStatistics, ignore_if_not_exists: bool)[source]¶

Update the statistics of a table.

Parameters

table_path – Path ObjectPath of the table.
table_statistics – New statistics CatalogTableStatistics to update.
ignore_if_not_exists – Flag to specify behavior if the table does not exist: if set to false, throw an exception, if set to true, nothing happens.

Raise

CatalogException in case of any runtime exception. TableNotExistException if the table does not exist in the catalog.

bulk_get_partition_column_statistics(table_path: pyflink.table.catalog.ObjectPath, partition_specs: List[CatalogPartitionSpec]) → List[pyflink.table.catalog.CatalogColumnStatistics][source]¶

Get a list of the column statistics for the given partitions.

Parameters

table_path – Path ObjectPath of the table.
partition_specs – The list of CatalogPartitionSpec of the given partitions.

Returns

The statistics list of CatalogTableStatistics of the given partitions.

Raise

CatalogException in case of any runtime exception. PartitionNotExistException if the partition does not exist.

bulk_get_partition_statistics(table_path: pyflink.table.catalog.ObjectPath, partition_specs: List[CatalogPartitionSpec]) → List[pyflink.table.catalog.CatalogTableStatistics][source]¶

Get a list of statistics of given partitions.

Parameters

table_path – Path ObjectPath of the table.
partition_specs – The list of CatalogPartitionSpec of the given partitions.

Returns

The statistics list of CatalogTableStatistics of the given partitions.

Raise

CatalogException in case of any runtime exception. PartitionNotExistException if the partition does not exist.

create_database(name: str, database: pyflink.table.catalog.CatalogDatabase, ignore_if_exists: bool)[source]¶

Create a database.

Parameters

name – Name of the database to be created.
database – The CatalogDatabase database definition.
ignore_if_exists – Flag to specify behavior when a database with the given name already exists: if set to false, throw a DatabaseAlreadyExistException, if set to true, do nothing.

Raise

CatalogException in case of any runtime exception. DatabaseAlreadyExistException if the given database already exists and ignoreIfExists is false.

create_function(function_path: pyflink.table.catalog.ObjectPath, function: pyflink.table.catalog.CatalogFunction, ignore_if_exists: bool)[source]¶

Create a function.

Parameters

function_path – Path ObjectPath of the function.
function – The function CatalogFunction to be created.
ignore_if_exists – Flag to specify behavior if a function with the given name already exists: if set to false, it throws a FunctionAlreadyExistException, if set to true, nothing happens.

Raise

CatalogException in case of any runtime exception. FunctionAlreadyExistException if the function already exist. DatabaseNotExistException if the given database does not exist.

create_partition(table_path: pyflink.table.catalog.ObjectPath, partition_spec: pyflink.table.catalog.CatalogPartitionSpec, partition: pyflink.table.catalog.CatalogPartition, ignore_if_exists: bool)[source]¶

Create a partition.

Parameters

table_path – Path ObjectPath of the table.
partition_spec – Partition spec CatalogPartitionSpec of the partition.
partition – The partition CatalogPartition to add.
ignore_if_exists – Flag to specify behavior if a table with the given name already exists: if set to false, it throws a TableAlreadyExistException, if set to true, nothing happens.

Raise

CatalogException in case of any runtime exception. TableNotExistException thrown if the target table does not exist. TableNotPartitionedException thrown if the target table is not partitioned. PartitionSpecInvalidException thrown if the given partition spec is invalid. PartitionAlreadyExistsException thrown if the target partition already exists.

create_table(table_path: pyflink.table.catalog.ObjectPath, table: pyflink.table.catalog.CatalogBaseTable, ignore_if_exists: bool)[source]¶

Create a new table or view.

Parameters

table_path – Path ObjectPath of the table or view to be created.
table – The table definition CatalogBaseTable.
ignore_if_exists – Flag to specify behavior when a table or view already exists at the given path: if set to false, it throws a TableAlreadyExistException, if set to true, do nothing.

Raise

CatalogException in case of any runtime exception. DatabaseNotExistException if the database in tablePath doesn’t exist. TableAlreadyExistException if table already exists and ignoreIfExists is false.

database_exists(database_name: str) → bool[source]¶

Check if a database exists in this catalog.

Parameters: database_name – Name of the database.
Returns: true if the given database exists in the catalog false otherwise.
Raise: CatalogException in case of any runtime exception.

drop_database(name: str, ignore_if_exists: bool)[source]¶

Drop a database.

Parameters

name – Name of the database to be dropped.
ignore_if_exists – Flag to specify behavior when the database does not exist: if set to false, throw an exception, if set to true, do nothing.

Raise

CatalogException in case of any runtime exception. DatabaseNotExistException if the given database does not exist.

drop_function(function_path: pyflink.table.catalog.ObjectPath, ignore_if_not_exists: bool)[source]¶

Drop a function.

Parameters

function_path – Path ObjectPath of the function to be dropped.
ignore_if_not_exists – Flag to specify behavior if the function does not exist: if set to false, throw an exception if set to true, nothing happens.

Raise

CatalogException in case of any runtime exception. FunctionNotExistException if the function does not exist.

drop_partition(table_path: pyflink.table.catalog.ObjectPath, partition_spec: pyflink.table.catalog.CatalogPartitionSpec, ignore_if_not_exists: bool)[source]¶

Drop a partition.

Parameters

table_path – Path ObjectPath of the table.
partition_spec – Partition spec CatalogPartitionSpec of the partition to drop.
ignore_if_not_exists – Flag to specify behavior if the database does not exist: if set to false, throw an exception, if set to true, nothing happens.

Raise

CatalogException in case of any runtime exception. PartitionNotExistException thrown if the target partition does not exist.

drop_table(table_path: pyflink.table.catalog.ObjectPath, ignore_if_not_exists: bool)[source]¶

Drop a table or view.

Parameters

table_path – Path ObjectPath of the table or view to be dropped.
ignore_if_not_exists – Flag to specify behavior when the table or view does not exist: if set to false, throw an exception, if set to true, do nothing.

Raise

CatalogException in case of any runtime exception. TableNotExistException if the table or view does not exist.

function_exists(function_path: pyflink.table.catalog.ObjectPath) → bool[source]¶

Check whether a function exists or not.

Parameters: function_path – Path ObjectPath of the function.
Returns: true if the function exists in the catalog false otherwise.
Raise: CatalogException in case of any runtime exception.

get_database(database_name: str) → pyflink.table.catalog.CatalogDatabase [source]¶

Get a database from this catalog.

Parameters: database_name – Name of the database.
Returns: The requested database CatalogDatabase.
Raise: CatalogException in case of any runtime exception. DatabaseNotExistException if the database does not exist.

get_default_database() → str[source]¶

Get the name of the default database for this catalog. The default database will be the current database for the catalog when user’s session doesn’t specify a current database. The value probably comes from configuration, will not change for the life time of the catalog instance.

Returns: The name of the current database.
Raise: CatalogException in case of any runtime exception.

get_function(function_path: pyflink.table.catalog.ObjectPath) → pyflink.table.catalog.CatalogFunction [source]¶

Get the function.

Parameters: function_path – Path ObjectPath of the function.
Returns: The requested function CatalogFunction.
Raise: CatalogException in case of any runtime exception. FunctionNotExistException if the function does not exist in the catalog.

get_partition(table_path: pyflink.table.catalog.ObjectPath, partition_spec: pyflink.table.catalog.CatalogPartitionSpec) → pyflink.table.catalog.CatalogPartition [source]¶

Get a partition of the given table. The given partition spec keys and values need to be matched exactly for a result.

Parameters

table_path – Path ObjectPath of the table.
partition_spec – The partition spec CatalogPartitionSpec of partition to get.

Returns

The requested partition CatalogPartition.

Raise

CatalogException in case of any runtime exception. PartitionNotExistException thrown if the partition doesn’t exist.

get_partition_column_statistics(table_path: pyflink.table.catalog.ObjectPath, partition_spec: pyflink.table.catalog.CatalogPartitionSpec) → pyflink.table.catalog.CatalogColumnStatistics [source]¶

Get the column statistics of a partition.

Parameters

table_path – Path ObjectPath of the table.
partition_spec – Partition spec CatalogPartitionSpec of the partition.

Returns

The column statistics CatalogColumnStatistics of the given partition.

Raise

CatalogException in case of any runtime exception. PartitionNotExistException if the partition does not exist.

get_partition_statistics(table_path: pyflink.table.catalog.ObjectPath, partition_spec: pyflink.table.catalog.CatalogPartitionSpec) → pyflink.table.catalog.CatalogTableStatistics [source]¶

Get the statistics of a partition.

Parameters

table_path – Path ObjectPath of the table.
partition_spec – Partition spec CatalogPartitionSpec of the partition.

Returns

The statistics CatalogTableStatistics of the given partition.

Raise

CatalogException in case of any runtime exception. PartitionNotExistException if the partition does not exist.

get_table(table_path: pyflink.table.catalog.ObjectPath) → pyflink.table.catalog.CatalogBaseTable [source]¶

Get a CatalogTable or CatalogView identified by tablePath.

Parameters: table_path – Path ObjectPath of the table or view.
Returns: The requested table or view CatalogBaseTable.
Raise: CatalogException in case of any runtime exception. TableNotExistException if the target does not exist.

get_table_column_statistics(table_path: pyflink.table.catalog.ObjectPath) → pyflink.table.catalog.CatalogColumnStatistics [source]¶

Get the column statistics of a table.

Parameters: table_path – Path ObjectPath of the table.
Returns: The column statistics CatalogColumnStatistics of the given table.
Raise: CatalogException in case of any runtime exception. TableNotExistException if the table does not exist in the catalog.

get_table_statistics(table_path: pyflink.table.catalog.ObjectPath) → pyflink.table.catalog.CatalogTableStatistics [source]¶

Get the statistics of a table.

Parameters: table_path – Path ObjectPath of the table.
Returns: The statistics CatalogTableStatistics of the given table.
Raise: CatalogException in case of any runtime exception. TableNotExistException if the table does not exist in the catalog.

list_databases() → List[str][source]¶

Get the names of all databases in this catalog.

Returns: A list of the names of all databases.
Raise: CatalogException in case of any runtime exception.

list_functions(database_name: str) → List[str][source]¶

List the names of all functions in the given database. An empty list is returned if none is registered.

Parameters: database_name – Name of the database.
Returns: A list of the names of the functions in this database.
Raise: CatalogException in case of any runtime exception. DatabaseNotExistException if the database does not exist.

list_partitions(table_path: pyflink.table.catalog.ObjectPath, partition_spec: Optional[pyflink.table.catalog.CatalogPartitionSpec] = None) → List[pyflink.table.catalog.CatalogPartitionSpec][source]¶

Get CatalogPartitionSpec of all partitions of the table.

Parameters

table_path – Path ObjectPath of the table.
partition_spec – The partition spec CatalogPartitionSpec to list.

Returns

A list of CatalogPartitionSpec of the table.

Raise

CatalogException in case of any runtime exception. TableNotExistException thrown if the table does not exist in the catalog. TableNotPartitionedException thrown if the table is not partitioned.

list_tables(database_name: str) → List[str][source]¶

Get names of all tables and views under this database. An empty list is returned if none exists.

Parameters: database_name – Name of the given database.
Returns: A list of the names of all tables and views in this database.
Raise: CatalogException in case of any runtime exception. DatabaseNotExistException if the database does not exist.

list_views(database_name: str) → List[str][source]¶

Get names of all views under this database. An empty list is returned if none exists.

Parameters: database_name – Name of the given database.
Returns: A list of the names of all views in the given database.
Raise: CatalogException in case of any runtime exception. DatabaseNotExistException if the database does not exist.

partition_exists(table_path: pyflink.table.catalog.ObjectPath, partition_spec: pyflink.table.catalog.CatalogPartitionSpec) → bool[source]¶

Check whether a partition exists or not.

Parameters

table_path – Path ObjectPath of the table.
partition_spec – Partition spec CatalogPartitionSpec of the partition to check.

Returns

true if the partition exists.

Raise

CatalogException in case of any runtime exception.

rename_table(table_path: pyflink.table.catalog.ObjectPath, new_table_name: str, ignore_if_not_exists: bool)[source]¶

Rename an existing table or view.

Parameters

table_path – Path ObjectPath of the table or view to be renamed.
new_table_name – The new name of the table or view.
ignore_if_not_exists – Flag to specify behavior when the table or view does not exist: if set to false, throw an exception, if set to true, do nothing.

Raise

CatalogException in case of any runtime exception. TableNotExistException if the table does not exist.

table_exists(table_path: pyflink.table.catalog.ObjectPath) → bool[source]¶

Check if a table or view exists in this catalog.

Parameters: table_path – Path ObjectPath of the table or view.
Returns: true if the given table exists in the catalog false otherwise.
Raise: CatalogException in case of any runtime exception.

class pyflink.table.catalog.CatalogBaseTable(j_catalog_base_table)[source]¶

CatalogBaseTable is the common parent of table and view. It has a map of key-value pairs defining the properties of the table.

copy() → pyflink.table.catalog.CatalogBaseTable [source]¶

Get a deep copy of the CatalogBaseTable instance.

Returns: An copy of the CatalogBaseTable instance.

static create_table(schema: pyflink.table.table_schema.TableSchema, partition_keys: List[str] = [], properties: Dict[str, str] = {}, comment: str = None) → pyflink.table.catalog.CatalogBaseTable [source]¶

Create an instance of CatalogBaseTable for the catalog table.

Parameters

schema – the table schema
partition_keys – the partition keys, default empty
properties – the properties of the catalog table
comment – the comment of the catalog table

static create_view(original_query: str, expanded_query: str, schema: pyflink.table.table_schema.TableSchema, properties: Dict[str, str], comment: str = None) → pyflink.table.catalog.CatalogBaseTable [source]¶

Create an instance of CatalogBaseTable for the catalog view.

Parameters

original_query – the original text of the view definition
expanded_query – the expanded text of the original view definition, this is needed because the context such as current DB is lost after the session, in which view is defined, is gone. Expanded query text takes care of the this, as an example.
schema – the table schema
properties – the properties of the catalog view
comment – the comment of the catalog view

get_comment() → str[source]¶

Get comment of the table or view.

Returns: Comment of the table/view.

get_description() → Optional[str][source]¶

Get a brief description of the table or view.

Returns: An optional short description of the table/view.

get_detailed_description() → Optional[str][source]¶

Get a detailed description of the table or view.

Returns: An optional long description of the table/view.

get_options()[source]¶

Returns a map of string-based options.

In case of CatalogTable, these options may determine the kind of connector and its configuration for accessing the data in the external system.

Returns: Property map of the table/view.

New in version 1.11.0.

get_schema() → pyflink.table.table_schema.TableSchema[source]¶

Get the schema of the table.

Returns: Schema of the table/view.

. note:: Deprecated in 1.14. This method returns the deprecated TableSchema class. The old class was a hybrid of resolved and unresolved schema information. It has been replaced by the new Schema which is always unresolved and will be resolved by the framework later.

get_unresolved_schema() → pyflink.table.schema.Schema[source]¶

Returns the schema of the table or view.

The schema can reference objects from other catalogs and will be resolved and validated by the framework when accessing the table or view.

class pyflink.table.catalog.CatalogColumnStatistics(column_statistics_data=None, properties=None, j_catalog_column_statistics=None)[source]¶

Column statistics of a table or partition.

copy() → pyflink.table.catalog.CatalogColumnStatistics [source]¶

get_column_statistics_data()[source]¶

get_properties() → Dict[str, str][source]¶

class pyflink.table.catalog.CatalogDatabase(j_catalog_database)[source]¶

Represents a database object in a catalog.

copy() → pyflink.table.catalog.CatalogDatabase [source]¶

Get a deep copy of the CatalogDatabase instance.

Returns: A copy of CatalogDatabase instance.

static create_instance(properties: Dict[str, str], comment: str = None) → pyflink.table.catalog.CatalogDatabase [source]¶

Creates an instance of CatalogDatabase.

Parameters

properties – Property of the database
comment – Comment of the database

get_comment() → str[source]¶

Get comment of the database.

Returns: Comment of the database.

get_description() → Optional[str][source]¶

Get a brief description of the database.

Returns: An optional short description of the database.

get_detailed_description() → Optional[str][source]¶

Get a detailed description of the database.

Returns: An optional long description of the database.

get_properties() → Dict[str, str][source]¶: Get a map of properties associated with the database.

class pyflink.table.catalog.CatalogFunction(j_catalog_function)[source]¶

Interface for a function in a catalog.

copy() → pyflink.table.catalog.CatalogFunction [source]¶

Create a deep copy of the function.

Returns: A deep copy of “this” instance.

static create_instance(class_name: str, function_language: str = 'Python') → pyflink.table.catalog.CatalogFunction [source]¶

Creates an instance of CatalogDatabase.

Parameters

class_name – full qualified path of the class name
function_language – language of the function, must be one of ‘Python’, ‘Java’ or ‘Scala’. (default Python)

get_class_name() → str[source]¶

Get the full name of the class backing the function.

Returns: The full name of the class.

get_description() → Optional[str][source]¶

Get a brief description of the function.

Returns: An optional short description of function.

get_detailed_description() → Optional[str][source]¶

Get a detailed description of the function.

Returns: An optional long description of the function.

get_function_language()[source]¶

Get the language used for the function definition.

Returns: the language type of the function definition

New in version 1.10.0.

is_generic() → bool[source]¶

Whether or not is the function a flink UDF.

Returns: Whether is the function a flink UDF.

New in version 1.10.0.

class pyflink.table.catalog.CatalogPartition(j_catalog_partition)[source]¶

Represents a partition object in catalog.

copy() → pyflink.table.catalog.CatalogPartition [source]¶

Get a deep copy of the CatalogPartition instance.

Returns: A copy of CatalogPartition instance.

static create_instance(properties: Dict[str, str], comment: str = None) → pyflink.table.catalog.CatalogPartition [source]¶

Creates an instance of CatalogPartition.

Parameters

properties – Property of the partition
comment – Comment of the partition

get_comment() → str[source]¶

Get comment of the partition.

Returns: Comment of the partition.

get_description() → Optional[str][source]¶

Get a brief description of the partition object.

Returns: An optional short description of partition object.

get_detailed_description() → Optional[str][source]¶

Get a detailed description of the partition object.

Returns: An optional long description of the partition object.

get_properties() → Dict[str, str][source]¶

Get a map of properties associated with the partition.

Returns: A map of properties with the partition.

class pyflink.table.catalog.CatalogPartitionSpec(partition_spec)[source]¶

Represents a partition spec object in catalog. Partition columns and values are NOT of strict order, and they need to be re-arranged to the correct order by comparing with a list of strictly ordered partition keys.

get_partition_spec() → Dict[str, str][source]¶

Get the partition spec as key-value map.

Returns: A map of partition spec keys and values.

class pyflink.table.catalog.CatalogTableStatistics(row_count=None, field_count=None, total_size=None, raw_data_size=None, properties=None, j_catalog_table_statistics=None)[source]¶

Statistics for a non-partitioned table or a partition of a partitioned table.

copy() → pyflink.table.catalog.CatalogTableStatistics [source]¶: Create a deep copy of “this” instance.

get_field_count() → int[source]¶: The number of files on disk.

get_properties() → Dict[str, str][source]¶

get_raw_data_size() → int[source]¶: The raw data size (size when loaded in memory) in bytes.

get_row_count() → int[source]¶: The number of rows in the table or partition.

get_total_size() → int[source]¶: The total size in bytes.

class pyflink.table.catalog.HiveCatalog(catalog_name: str, default_database: str = None, hive_conf_dir: str = None)[source]¶: A catalog implementation for Hive.

class pyflink.table.catalog.ObjectPath(database_name=None, object_name=None, j_object_path=None)[source]¶

A database name and object (table/view/function) name combo in a catalog.

static from_string(full_name: str) → pyflink.table.catalog.ObjectPath [source]¶

get_database_name() → str[source]¶

get_full_name() → str[source]¶

get_object_name() → str[source]¶

pyflink.table.module module¶

class pyflink.table.module.HiveModule(hive_version: str = None)[source]¶: Module to provide Hive built-in metadata.

New in version 1.12.0.

class pyflink.table.module.Module(j_module)[source]¶: Modules define a set of metadata, including functions, user defined types, operators, rules, etc. Metadata from modules are regarded as built-in or system metadata that users can take advantages of.

New in version 1.12.0.

class pyflink.table.module.ModuleEntry(name: str, used: bool, j_module_entry=None)[source]¶

A POJO to represent a module’s name and use status.

name() → str[source]¶

used() → bool[source]¶

pyflink.table package¶

Module contents¶

pyflink.table.expressions module¶

pyflink.table.window module¶

pyflink.table.descriptors module¶

pyflink.table.catalog module¶

pyflink.table.module module¶

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