kgyrtkirk commented on a change in pull request #1439:
URL: https://github.com/apache/hive/pull/1439#discussion_r482092255
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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)) {
Review comment:
yes; if we use `isLe` the current cost model which only takes rowcount
into account will prefer the pushing aggregates further
there is another alternative to the `force` based approach: the rule can be
configured to use the more advanced cost system - so that it could take cpu/io
cost into account
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