org.apache.beam.sdk.io.parquet

Class ParquetIO.Read

java.lang.Object

org.apache.beam.sdk.transforms.PTransform<PBegin,PCollection<GenericRecord>>

org.apache.beam.sdk.io.parquet.ParquetIO.Read

All Implemented Interfaces:

java.io.Serializable, HasDisplayData

Enclosing class:

ParquetIO

public abstract static class ParquetIO.Read
extends PTransform<PBegin,PCollection<GenericRecord>>

Implementation of ParquetIO.read(Schema).

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.beam.sdk.transforms.PTransform

name

Constructor Summary

Constructors

Constructor and Description
Read()

Method Summary

Modifier and Type	Method and Description
PCollection<GenericRecord>	expand(PBegin input) Override this method to specify how this PTransform should be expanded on the given InputT.
ParquetIO.Read	from(java.lang.String filepattern) Like from(ValueProvider).
ParquetIO.Read	from(ValueProvider<java.lang.String> filepattern) Reads from the given filename or filepattern.
void	populateDisplayData(DisplayData.Builder builder) Register display data for the given transform or component.
ParquetIO.Read	withAvroDataModel(GenericData model) Define the Avro data model; see AvroParquetReader.Builder#withDataModel(GenericData).
ParquetIO.Read	withProjection(Schema projectionSchema, Schema encoderSchema) Enable the reading with projection.
ParquetIO.Read	withSplit() Enable the Splittable reading.

Methods inherited from class org.apache.beam.sdk.transforms.PTransform

compose, compose, getAdditionalInputs, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, toString, validate

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Read

public Read()

Method Detail

from

public ParquetIO.Read from(ValueProvider<java.lang.String> filepattern)

Reads from the given filename or filepattern.

from

public ParquetIO.Read from(java.lang.String filepattern)

Like from(ValueProvider).

withProjection

public ParquetIO.Read withProjection(Schema projectionSchema,
                                     Schema encoderSchema)

Enable the reading with projection.

withSplit

public ParquetIO.Read withSplit()

Enable the Splittable reading.

withAvroDataModel

public ParquetIO.Read withAvroDataModel(GenericData model)

Define the Avro data model; see AvroParquetReader.Builder#withDataModel(GenericData).

expand

public PCollection<GenericRecord> expand(PBegin input)

Description copied from class: PTransform

Override this method to specify how this PTransform should be expanded on the given InputT.

NOTE: This method should not be called directly. Instead apply the PTransform should be applied to the InputT using the apply method.

Composite transforms, which are defined in terms of other transforms, should return the output of one of the composed transforms. Non-composite transforms, which do not apply any transforms internally, should return a new unbound output and register evaluators (via backend-specific registration methods).

Specified by:

expand in class PTransform<PBegin,PCollection<GenericRecord>>

populateDisplayData

public void populateDisplayData(DisplayData.Builder builder)

Description copied from class: PTransform

Register display data for the given transform or component.

populateDisplayData(DisplayData.Builder) is invoked by Pipeline runners to collect display data via DisplayData.from(HasDisplayData). Implementations may call super.populateDisplayData(builder) in order to register display data in the current namespace, but should otherwise use subcomponent.populateDisplayData(builder) to use the namespace of the subcomponent.

By default, does not register any display data. Implementors may override this method to provide their own display data.

Specified by:

populateDisplayData in interface HasDisplayData

Overrides:

populateDisplayData in class PTransform<PBegin,PCollection<GenericRecord>>

Parameters:

builder - The builder to populate with display data.

See Also:

HasDisplayData