Google Cloud Dataflow SDK for Java, version 1.9.1
Class GroupByKey.GroupByKeyOnly<K,V>
- java.lang.Object
-
- com.google.cloud.dataflow.sdk.transforms.PTransform<PCollection<KV<K,V>>,PCollection<KV<K,Iterable<V>>>>
-
- com.google.cloud.dataflow.sdk.transforms.GroupByKey.GroupByKeyOnly<K,V>
-
- All Implemented Interfaces:
- HasDisplayData, Serializable
- Enclosing class:
- GroupByKey<K,V>
public static class GroupByKey.GroupByKeyOnly<K,V> extends PTransform<PCollection<KV<K,V>>,PCollection<KV<K,Iterable<V>>>>
Primitive helper transform that groups by key only, ignoring any window assignments.- See Also:
- Serialized Form
-
-
Field Summary
-
Fields inherited from class com.google.cloud.dataflow.sdk.transforms.PTransform
name
-
-
Constructor Summary
Constructors Constructor and Description GroupByKeyOnly()
-
Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method and Description PCollection<KV<K,Iterable<V>>>
apply(PCollection<KV<K,V>> input)
Applies thisPTransform
on the givenInputT
, and returns itsOutput
.protected Coder<KV<K,Iterable<V>>>
getDefaultOutputCoder(PCollection<KV<K,V>> input)
Returns the defaultCoder
to use for the output of this single-outputPTransform
when applied to the given input.-
Methods inherited from class com.google.cloud.dataflow.sdk.transforms.PTransform
getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, populateDisplayData, toString, validate
-
-
-
-
Method Detail
-
apply
public PCollection<KV<K,Iterable<V>>> apply(PCollection<KV<K,V>> input)
Description copied from class:PTransform
Applies thisPTransform
on the givenInputT
, and returns itsOutput
.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).
The default implementation throws an exception. A derived class must either implement apply, or else each runner must supply a custom implementation via
PipelineRunner.apply(com.google.cloud.dataflow.sdk.transforms.PTransform<InputT, OutputT>, InputT)
.- Overrides:
apply
in classPTransform<PCollection<KV<K,V>>,PCollection<KV<K,Iterable<V>>>>
-
getDefaultOutputCoder
protected Coder<KV<K,Iterable<V>>> getDefaultOutputCoder(PCollection<KV<K,V>> input)
Description copied from class:PTransform
Returns the defaultCoder
to use for the output of this single-outputPTransform
when applied to the given input.By default, always throws.
- Overrides:
getDefaultOutputCoder
in classPTransform<PCollection<KV<K,V>>,PCollection<KV<K,Iterable<V>>>>
-
-