Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1822#discussion_r56904780
--- Diff:
flink-optimizer/src/main/java/org/apache/flink/optimizer/operators/GroupReduceWithCombineProperties.java
---
@@ -90,6 +94,9 @@ public DriverStrategy getStrategy() {
@Override
public SingleInputPlanNode instantiate(Channel in, SingleInputNode
node) {
if (in.getShipStrategy() == ShipStrategyType.FORWARD) {
+ if(in.getSource().getOptimizerNode() instanceof
PartitionNode) {
+ LOG.warn("Consider adding an explicit
CombinerFunction with groupCombine in front of the partition operator");
--- End diff --
Can you extend the error message as follows?
> Cannot automatically inject combiner for GroupReduceFunction. Please add
an explicit combiner with combineGroup() in front of the partition operator.
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