kgyrtkirk commented on a change in pull request #1439:
URL: https://github.com/apache/hive/pull/1439#discussion_r484439075
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File path:
ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/rules/HiveAggregateJoinTransposeRule.java
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@@ -290,7 +291,8 @@ public void onMatch(RelOptRuleCall call) {
RelNode r = relBuilder.build();
RelOptCost afterCost = mq.getCumulativeCost(r);
RelOptCost beforeCost = mq.getCumulativeCost(aggregate);
- if (afterCost.isLt(beforeCost)) {
+ boolean shouldForceTransform = isGroupingUnique(join,
aggregate.getGroupSet());
Review comment:
I've added a config: `hive.transpose.aggr.join.unique` to enable/disable
this feature
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