Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1553#discussion_r53153193
--- Diff:
flink-optimizer/src/main/java/org/apache/flink/optimizer/operators/ReduceProperties.java
---
@@ -59,37 +65,69 @@ public DriverStrategy getStrategy() {
@Override
public SingleInputPlanNode instantiate(Channel in, SingleInputNode
node) {
if (in.getShipStrategy() == ShipStrategyType.FORWARD ||
- (node.getBroadcastConnections() != null &&
!node.getBroadcastConnections().isEmpty()))
+ (node.getBroadcastConnections() != null &&
!node.getBroadcastConnections().isEmpty()))
{
+ // adjust a sort (changes grouping, so it must be for
this driver to combining sort
+ if(in.getSource().getOptimizerNode() instanceof
PartitionNode) {
--- End diff --
Please refactor the code of this branch into a method called
`injectCombinerBeforePartitioner()`. Some of the comments in the other class
apply here as well.
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