How to use

withSideInputs

method

in

org.apache.beam.sdk.transforms.Combine$GroupedValues

public GroupedValues<K, InputT, OutputT> withSideInputs(PCollectionView<?>... sideInputs) {
 return withSideInputs(Arrays.asList(sideInputs));
}

@Override
public PCollection<KV<K, OutputT>> expand(PCollection<KV<K, InputT>> input) {
 return input
   .apply(fewKeys ? GroupByKey.createWithFewKeys() : GroupByKey.create())
   .apply(
     Combine.<K, InputT, OutputT>groupedValues(fn, fnDisplayData)
       .withSideInputs(sideInputs));
}

/** Creates a simple pipeline with a {@link Combine.GroupedValues} with side inputs. */
private static TestPipeline createCombineGroupedValuesWithSideInputsPipeline() {
 TestPipeline pipeline = TestPipeline.create().enableAbandonedNodeEnforcement(false);
 PCollection<KV<String, Integer>> input =
   pipeline
     .apply(Create.of(KV.of("key", 1)))
     .setCoder(KvCoder.of(StringUtf8Coder.of(), VarIntCoder.of()));
 PCollection<String> sideInput = pipeline.apply(Create.of("side input"));
 PCollectionView<String> sideInputView = sideInput.apply(View.asSingleton());
 input
   .apply(GroupByKey.create())
   .apply(
     Combine.<String, Integer, Integer>groupedValues(new SumCombineFnWithContext())
       .withSideInputs(sideInputView));
 return pipeline;
}