Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1553#discussion_r51259067
--- Diff:
flink-optimizer/src/main/java/org/apache/flink/optimizer/operators/GroupReduceWithCombineProperties.java
---
@@ -102,36 +107,72 @@ public SingleInputPlanNode instantiate(Channel in,
SingleInputNode node) {
DriverStrategy.SORTED_GROUP_REDUCE, this.keyList);
} else {
// non forward case. all local properties are killed
anyways, so we can safely plug in a combiner
--- End diff --
The `else` branch will not be entered if the GroupReduce's predecessor is a
Partition operator.
You need to add an `if else` branch to the condition.
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