CoGroup.Impl (core 2.44.0 API)

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

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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>>