org.apache.beam.sdk.transforms

Class View.VoidKeyToMultimapMaterialization<T>

java.lang.Object

org.apache.beam.sdk.transforms.PTransform<PCollection<T>,PCollection<KV<java.lang.Void,T>>>

org.apache.beam.sdk.transforms.View.VoidKeyToMultimapMaterialization<T>

All Implemented Interfaces:

java.io.Serializable, HasDisplayData

Enclosing class:

View

@Internal
public static class View.VoidKeyToMultimapMaterialization<T>
extends PTransform<PCollection<T>,PCollection<KV<java.lang.Void,T>>>

A PTransform which converts all values into KVs with Void keys.

TODO(BEAM-10097): Replace this materialization with specializations that optimize the various SDK requested views.

See Also:

Serialized Form

Field Summary

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

name

Constructor Summary

Constructors

Constructor and Description
VoidKeyToMultimapMaterialization()

Method Summary

Modifier and Type	Method and Description
PCollection<KV<java.lang.Void,T>>	expand(PCollection<T> input) Override this method to specify how this PTransform should be expanded on the given InputT.

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

VoidKeyToMultimapMaterialization

public VoidKeyToMultimapMaterialization()

Method Detail

expand

public PCollection<KV<java.lang.Void,T>> expand(PCollection<T> 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<PCollection<T>,PCollection<KV<java.lang.Void,T>>>