org.apache.beam.sdk.schemas.transforms

Class CoGroup.Impl

java.lang.Object

org.apache.beam.sdk.transforms.PTransform<PCollectionTuple,PCollection<Row>>

org.apache.beam.sdk.schemas.transforms.CoGroup.Impl

All Implemented Interfaces:

java.io.Serializable, HasDisplayData

Enclosing class:

CoGroup

public static class CoGroup.Impl
extends PTransform<PCollectionTuple,PCollection<Row>>

The implementing PTransform.

See Also:

Serialized Form

Field Summary

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

name, resourceHints

Method Summary

Modifier and Type	Method and Description
CoGroup.ExpandCrossProduct	crossProductJoin() Expand the join into individual rows, similar to SQL joins.
PCollection<Row>	expand(PCollectionTuple input) Override this method to specify how this PTransform should be expanded on the given InputT.
CoGroup.Impl	join(java.lang.String tag, CoGroup.By clause) Select the following fields for the specified PCollection with the specified join args.
CoGroup.Impl	withKeyField(java.lang.String keyFieldName)

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

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

Methods inherited from class java.lang.Object

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

Method Detail

withKeyField

public CoGroup.Impl withKeyField(java.lang.String keyFieldName)

join

public CoGroup.Impl join(java.lang.String tag,
                         CoGroup.By clause)

Select the following fields for the specified PCollection with the specified join args.

Each PCollection in the input must have fields specified for the join key.

crossProductJoin

public CoGroup.ExpandCrossProduct crossProductJoin()

Expand the join into individual rows, similar to SQL joins.

expand

public PCollection<Row> expand(PCollectionTuple 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<PCollectionTuple,PCollection<Row>>