Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18429#discussion_r124320360
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -152,6 +153,17 @@ abstract class Optimizer(sessionCatalog:
SessionCatalog, conf: SQLConf)
}
/**
+ * Remove useless DISTINCT for MAX and MIN.
+ * This rule should be applied before ReplaceDeduplicateWithAggregate.
+ */
+object EliminateDistinct extends Rule[LogicalPlan] {
+ override def apply(plan: LogicalPlan): LogicalPlan = plan
transformExpressions {
+ case AggregateExpression(max: Max, _, true, _) =>
AggregateExpression(max, Complete, false)
--- End diff --
The `ResolveFunctions` rule already set it to `Complete`. @gengliangwang we
should just keep the AggregateMode unchanged.
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