Akshat-Jain commented on code in PR #16804:
URL: https://github.com/apache/druid/pull/16804#discussion_r1698260880
##########
extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/querykit/WindowOperatorQueryKit.java:
##########
@@ -328,4 +321,29 @@ private ShuffleSpec
findShuffleSpecForNextWindow(List<OperatorFactory> operatorF
return new HashShuffleSpec(new ClusterBy(keyColsOfWindow, 0),
maxWorkerCount);
}
+
+ /**
+ * Override the shuffle spec of the last stage based on the shuffling
required by the first window stage.
+ * @param queryId
+ * @param dataSourcePlan
+ * @param shuffleSpec
+ * @return
+ */
+ private QueryDefinitionBuilder makeQueryDefinitionBuilder(String queryId,
DataSourcePlan dataSourcePlan, ShuffleSpec shuffleSpec)
+ {
+ final QueryDefinitionBuilder queryDefBuilder =
QueryDefinition.builder(queryId);
+ int previousStageNumber =
dataSourcePlan.getSubQueryDefBuilder().get().build().getFinalStageDefinition().getStageNumber();
+ for (final StageDefinition stageDef :
dataSourcePlan.getSubQueryDefBuilder().get().build().getStageDefinitions()) {
+ if (stageDef.getStageNumber() == previousStageNumber) {
+ RowSignature rowSignature = QueryKitUtils.sortableSignature(
+ stageDef.getSignature(),
+ shuffleSpec.clusterBy().getColumns()
+ );
+
queryDefBuilder.add(StageDefinition.builder(stageDef).shuffleSpec(shuffleSpec).signature(rowSignature));
Review Comment:
If we throw error when the shuffleSpec is non-null for the stage that's
getting overridden, a lot of tests fail in MSQDrillWindowQueryTest: 754 tests
failed, 114 tests passed.
We can't throw an error when it's non-null 😅
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