Github user apivovarov commented on a diff in the pull request:
https://github.com/apache/flink/pull/2490#discussion_r78287335
--- Diff:
flink-java/src/main/java/org/apache/flink/api/java/operators/CrossOperator.java
---
@@ -129,14 +129,11 @@ private String getDefaultName() {
public DefaultCross(DataSet<I1> input1, DataSet<I2> input2,
CrossHint hint, String defaultName) {
- super(input1, input2, new DefaultCrossFunction<I1,
I2>(),
+ super(Preconditions.checkNotNull(input1, "input1 is
null"),
--- End diff --
DefaultCross calls `input1.getType()` and `input2.getType()` before calling
super() on line 134. So, if we add null check to super class (e.g.
TwoInputOperator) it will not work for DefaultCross
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