Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1553#discussion_r53152240
--- Diff:
flink-optimizer/src/main/java/org/apache/flink/optimizer/operators/GroupReduceWithCombineProperties.java
---
@@ -87,19 +92,39 @@ public DriverStrategy getStrategy() {
return DriverStrategy.SORTED_GROUP_REDUCE;
}
- @Override
public SingleInputPlanNode instantiate(Channel in, SingleInputNode
node) {
if (in.getShipStrategy() == ShipStrategyType.FORWARD) {
// adjust a sort (changes grouping, so it must be for
this driver to combining sort
- if (in.getLocalStrategy() == LocalStrategy.SORT) {
- if
(!in.getLocalStrategyKeys().isValidUnorderedPrefix(this.keys)) {
- throw new RuntimeException("Bug:
Inconsistent sort for group strategy.");
+ if(in.getSource().getOptimizerNode() instanceof
PartitionNode) {
+ // Inject a combiner before the partition node
+ Channel toCombiner = new
Channel(in.getSource());
+
toCombiner.setShipStrategy(ShipStrategyType.FORWARD,
DataExchangeMode.PIPELINED);
+ GroupReduceNode combinerNode =
((GroupReduceNode) node).getCombinerUtilityNode();
+
combinerNode.setParallelism(in.getSource().getParallelism());
+
if(toCombiner.getSource().getInputs().iterator().hasNext()) {
+ Channel source =
toCombiner.getSource().getInputs().iterator().next();
+ // A combiner plan node is created with
the map as the input
--- End diff --
The operator before the partitioner is not necessarily a `mapper`.
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