Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/16970#discussion_r102378336
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -1143,6 +1144,24 @@ object ReplaceDistinctWithAggregate extends
Rule[LogicalPlan] {
}
/**
+ * Replaces logical [[Deduplication]] operator with an [[Aggregate]]
operator.
+ */
+object ReplaceDeduplicationWithAggregate extends Rule[LogicalPlan] {
--- End diff --
`ReplaceDeduplicateWithAggregate`. see comment below.
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