org.apache.flink.formats.avro

Class AvroRowDataDeserializationSchema

java.lang.Object

org.apache.flink.formats.avro.AvroRowDataDeserializationSchema

All Implemented Interfaces:

Serializable, DeserializationSchema<RowData>, ResultTypeQueryable<RowData>

@PublicEvolving
public class AvroRowDataDeserializationSchema
extends Object
implements DeserializationSchema<RowData>

Deserialization schema from Avro bytes to RowData.

Deserializes the byte[] messages into (nested) Flink RowData. It converts Avro types into types that are compatible with Flink's Table & SQL API.

Projects with Avro records containing logical date/time types need to add a JodaTime dependency.

Note: Changes in this class need to be kept in sync with the corresponding runtime class AvroRowDataSerializationSchema and schema converter AvroSchemaConverter.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.flink.api.common.serialization.DeserializationSchema

DeserializationSchema.InitializationContext

Constructor Summary

Constructors

Constructor and Description
AvroRowDataDeserializationSchema(DeserializationSchema<org.apache.avro.generic.GenericRecord> nestedSchema, AvroToRowDataConverters.AvroToRowDataConverter runtimeConverter, TypeInformation<RowData> typeInfo) Creates a Avro deserialization schema for the given logical type.
AvroRowDataDeserializationSchema(RowType rowType, TypeInformation<RowData> typeInfo) Creates a Avro deserialization schema for the given logical type.

Method Summary

Modifier and Type	Method and Description
RowData	deserialize(byte[] message) Deserializes the byte message.
boolean	equals(Object o)
TypeInformation<RowData>	getProducedType() Gets the data type (as a TypeInformation) produced by this function or input format.
int	hashCode()
boolean	isEndOfStream(RowData nextElement) Method to decide whether the element signals the end of the stream.
void	open(DeserializationSchema.InitializationContext context) Initialization method for the schema.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.flink.api.common.serialization.DeserializationSchema

deserialize

Constructor Detail

AvroRowDataDeserializationSchema

public AvroRowDataDeserializationSchema(RowType rowType,
                                        TypeInformation<RowData> typeInfo)

Creates a Avro deserialization schema for the given logical type.

Parameters:

rowType - The logical type used to deserialize the data.

typeInfo - The TypeInformation to be used by getProducedType().

AvroRowDataDeserializationSchema

public AvroRowDataDeserializationSchema(DeserializationSchema<org.apache.avro.generic.GenericRecord> nestedSchema,
                                        AvroToRowDataConverters.AvroToRowDataConverter runtimeConverter,
                                        TypeInformation<RowData> typeInfo)

Creates a Avro deserialization schema for the given logical type.

Parameters:

nestedSchema - Deserialization schema to deserialize as GenericRecord

runtimeConverter - Converter that transforms a GenericRecord into RowData

typeInfo - The TypeInformation to be used by getProducedType()

Method Detail

open

public void open(DeserializationSchema.InitializationContext context)
          throws Exception

Description copied from interface: DeserializationSchema

Initialization method for the schema. It is called before the actual working methods DeserializationSchema.deserialize(byte[]) and thus suitable for one time setup work.

The provided DeserializationSchema.InitializationContext can be used to access additional features such as e.g. registering user metrics.

Specified by:

open in interface DeserializationSchema<RowData>

Parameters:

context - Contextual information that can be used during initialization.

Throws:

Exception

deserialize

public RowData deserialize(@Nullable
                           byte[] message)
                    throws IOException

Description copied from interface: DeserializationSchema

Deserializes the byte message.

Specified by:

deserialize in interface DeserializationSchema<RowData>

Parameters:

message - The message, as a byte array.

Returns:

The deserialized message as an object (null if the message cannot be deserialized).

Throws:

IOException

isEndOfStream

public boolean isEndOfStream(RowData nextElement)

Description copied from interface: DeserializationSchema

Method to decide whether the element signals the end of the stream. If true is returned the element won't be emitted.

Specified by:

isEndOfStream in interface DeserializationSchema<RowData>

Parameters:

nextElement - The element to test for the end-of-stream signal.

Returns:

True, if the element signals end of stream, false otherwise.

getProducedType

public TypeInformation<RowData> getProducedType()

Description copied from interface: ResultTypeQueryable

Gets the data type (as a TypeInformation) produced by this function or input format.

Specified by:

getProducedType in interface ResultTypeQueryable<RowData>

Returns:

The data type produced by this function or input format.

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object