Package org.apache.flink.table.types.logical

Class TimestampType

  • All Implemented Interfaces:
    Serializable
    @PublicEvolving
public final class TimestampType
extends LogicalType
    Logical type of a timestamp WITHOUT time zone consisting 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 as the semantics are closer to LocalDateTime.

    The serialized string representation is TIMESTAMP(p) where p is the number of digits of fractional seconds (=precision). p must have a value between 0 and 9 (both inclusive). If no precision is specified, p is equal to 6. TIMESTAMP(p) WITHOUT TIME ZONE is a synonym for this type.

    A conversion from and to long is not supported as this would imply a time zone. However, this type is time zone free. For more Instant-like semantics use LocalZonedTimestampType.

    See Also:
    ZonedTimestampType, LocalZonedTimestampType, Serialized Form

    • Constructor Detail

      • TimestampType

        @Internal
public TimestampType​(boolean isNullable,
                     TimestampKind kind,
                     int precision)
        Internal constructor that allows attaching additional metadata about time attribute properties. The additional metadata does not affect equality or serializability.

        Use getKind() for comparing this metadata.

      • TimestampType

        public TimestampType​(boolean isNullable,
                     int precision)

      • TimestampType

        public TimestampType​(int precision)

      • TimestampType

        public TimestampType()

    • Method Detail

      • getPrecision

        public int getPrecision()

      • copy

        public LogicalType copy​(boolean isNullable)
        Description copied from class: LogicalType
        Returns a deep copy of this type with possibly different nullability.
        Specified by:
        copy in class LogicalType
        Parameters:
        isNullable - the intended nullability of the copied type
        Returns:
        a deep copy

      • asSerializableString

        public String asSerializableString()
        Description copied from class: LogicalType
        Returns a string that fully serializes this instance. The serialized string can be used for transmitting or persisting a type.

        See LogicalTypeParser for the reverse operation.

        Specified by:
        asSerializableString in class LogicalType
        Returns:
        detailed string for transmission or persistence

      • asSummaryString

        public String asSummaryString()
        Description copied from class: LogicalType
        Returns a string that summarizes this type for printing to a console. An implementation might shorten long names or skips very specific properties.

        Use LogicalType.asSerializableString() for a type string that fully serializes this instance.

        Overrides:
        asSummaryString in class LogicalType
        Returns:
        summary string of this type for debugging purposes

      • supportsInputConversion

        public boolean supportsInputConversion​(Class<?> clazz)
        Description copied from class: LogicalType
        Returns whether an instance of the given class can be represented as a value of this logical type when entering the table ecosystem. This method helps for the interoperability between JVM-based languages and the relational type system.

        A supported conversion directly maps an input class to a logical type without loss of precision or type widening.

        For example, java.lang.Long or long can be used as input for BIGINT independent of the set nullability.

        Specified by:
        supportsInputConversion in class LogicalType
        Parameters:
        clazz - input class to be converted into this logical type
        Returns:
        flag that indicates if instances of this class can be used as input into the table ecosystem
        See Also:
        LogicalType.getDefaultConversion()

      • supportsOutputConversion

        public boolean supportsOutputConversion​(Class<?> clazz)
        Description copied from class: LogicalType
        Returns whether a value of this logical type can be represented as an instance of the given class when leaving the table ecosystem. This method helps for the interoperability between JVM-based languages and the relational type system.

        A supported conversion directly maps a logical type to an output class without loss of precision or type widening.

        For example, java.lang.Long or long can be used as output for BIGINT if the type is not nullable. If the type is nullable, only java.lang.Long can represent this.

        Specified by:
        supportsOutputConversion in class LogicalType
        Parameters:
        clazz - output class to be converted from this logical type
        Returns:
        flag that indicates if instances of this class can be used as output from the table ecosystem
        See Also:
        LogicalType.getDefaultConversion()