Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1553#discussion_r55205009
--- Diff:
flink-optimizer/src/main/java/org/apache/flink/optimizer/operators/GroupReduceWithCombineProperties.java
---
@@ -126,12 +117,66 @@ public SingleInputPlanNode instantiate(Channel in,
SingleInputNode node) {
}
toReducer.setLocalStrategy(LocalStrategy.COMBININGSORT,
in.getLocalStrategyKeys(),
in.getLocalStrategySortOrder());
-
return new SingleInputPlanNode(node, "Reduce
("+node.getOperator().getName()+")",
toReducer, DriverStrategy.SORTED_GROUP_REDUCE, this.keyList);
}
}
+ private SingleInputPlanNode injectCombinerBeforPartitioner(Channel in,
SingleInputNode node) {
+ // Inject a combiner before the partition node
+ Channel channelWithPartitionSrc = new Channel(in.getSource());
--- End diff --
This channel is not really used and should not be created
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