[GitHub] fhueske commented on a change in pull request #6003: [FLINK-9289][Dataset] Parallelism of generated operators should have max parallelism of input

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fhueske commented on a change in pull request #6003: [FLINK-9289][Dataset] Parallelism of generated operators should have max parallelism of input
URL: https://github.com/apache/flink/pull/6003#discussion_r209909097
 
 

 ##########
 File path: flink-java/src/main/java/org/apache/flink/api/java/operators/UnionOperator.java
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 @@ -62,4 +62,10 @@ public UnionOperator(DataSet<T> input1, DataSet<T> input2, String unionLocationN
 	protected Union<T> translateToDataFlow(Operator<T> input1, Operator<T> input2) {
 		return new Union<T>(input1, input2, unionLocationName);
 	}
+
+	@Override
+	public UnionOperator<T> setParallelism(int parallelism) {
+		// The parallelism of an UnionOperator should not be set.
 
 Review comment:
   Change the comment to: "Union is not translated to an independent operator but executed by multiplexing its input on the following operator. Hence, the parallelism of a Union cannot be set."

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