sdk/src/main/java/com/google/cloud/dataflow/sdk/runners/worker/CombineValuesFn.java [157:170]:
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      String stepName,
      String transformName,
      DataflowExecutionContext executionContext,
      CounterSet.AddCounterMutator addCounterMutator,
      StateSampler stateSampler) {
    super(
        options,
        NullSideInputReader.empty(),
        Arrays.asList("output"),
        stepName,
        transformName,
        executionContext,
        addCounterMutator,
        stateSampler);
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sdk/src/main/java/com/google/cloud/dataflow/sdk/runners/worker/GroupAlsoByWindowsParDoFn.java [254:267]:
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      String stepName,
      String transformName,
      DataflowExecutionContext executionContext,
      CounterSet.AddCounterMutator addCounterMutator,
      StateSampler stateSampler) {
    super(
        options,
        NullSideInputReader.empty(),
        Arrays.asList("output"),
        stepName,
        transformName,
        executionContext,
        addCounterMutator,
        stateSampler);
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