Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/18429#discussion_r124457557
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -152,6 +153,19 @@ abstract class Optimizer(sessionCatalog:
SessionCatalog, conf: SQLConf)
}
/**
+ * Remove useless DISTINCT for MAX and MIN.
+ * This rule should be applied before RewriteDistinctAggregates.
+ */
+object EliminateDistinct extends Rule[LogicalPlan] {
+ override def apply(plan: LogicalPlan): LogicalPlan = plan
transformExpressions {
+ case ae: AggregateExpression if ae.isDistinct =>
+ ae.aggregateFunction match {
+ case _: Max | _: Min => ae.copy(isDistinct = false)
--- End diff --
actually i made a mistake earlier. you'd need to do a match on other cases
and return the ae itself too
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