Github user ChengXiangLi commented on a diff in the pull request:
https://github.com/apache/flink/pull/1255#discussion_r44521192
--- Diff:
flink-optimizer/src/main/java/org/apache/flink/optimizer/operators/GroupReduceWithCombineProperties.java
---
@@ -121,6 +121,9 @@ public SingleInputPlanNode instantiate(Channel in,
SingleInputNode node) {
Channel toReducer = new Channel(combiner);
toReducer.setShipStrategy(in.getShipStrategy(),
in.getShipStrategyKeys(),
in.getShipStrategySortOrder(), in.getDataExchangeMode());
+ if (in.getShipStrategy() ==
ShipStrategyType.PARTITION_RANGE) {
--- End diff --
In this case, a sourceNode-->targetNode would be transferred into
sourceNode --> combineNode --> targetNode, if it's range partition between
sourceNode and targetNode, the data distribution is forget to copy to the new
created channel.
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