Github user rmetzger commented on a diff in the pull request:
https://github.com/apache/flink/pull/311#discussion_r23069617
--- Diff:
flink-compiler/src/main/java/org/apache/flink/compiler/dag/BinaryUnionNode.java
---
@@ -266,4 +268,44 @@ public void computeOutputEstimates(DataStatistics
statistics) {
this.estimatedOutputSize = in1.estimatedOutputSize > 0 &&
in2.estimatedOutputSize > 0 ?
in1.estimatedOutputSize + in2.estimatedOutputSize : -1;
}
+
+ public static class UnionSemanticProperties implements
SemanticProperties {
+
+ @Override
+ public FieldSet getTargetFields(int input, int sourceField) {
+ if (input != 0 && input != 1) {
+ throw new IndexOutOfBoundsException();
--- End diff --
How about returning an exception that explains that unions only support
input to be 0 or 1. ?
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