wangyum commented on a change in pull request #31113:
URL: https://github.com/apache/spark/pull/31113#discussion_r595755856
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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@@ -1663,8 +1663,12 @@ object ReplaceDeduplicateWithAggregate extends
Rule[LogicalPlan] {
/**
* Replaces logical [[Intersect]] operator with a left-semi [[Join]] operator.
* {{{
- * SELECT a1, a2 FROM Tab1 INTERSECT SELECT b1, b2 FROM Tab2
- * ==> SELECT DISTINCT a1, a2 FROM Tab1 LEFT SEMI JOIN Tab2 ON a1<=>b1 AND
a2<=>b2
Review comment:
Do you mean only push down distinct when CBO is enabled and all column
stats are exist and there are duplicate values?
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