Github user rxin commented on a diff in the pull request: https://github.com/apache/spark/pull/18429#discussion_r124452275 --- 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 AggregateExpression(max: Max, mode: AggregateMode, true, _) => --- End diff -- it's unclear what the "true" is. I'd either use named argument, or rewrite it to something like ``` case ae: AggregateExpression if ae.isDistinct => ae.aggregateFunction match { case _: Max | _: Min => ae.copy(isDistinct = false) } } ```
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