cloud-fan commented on a change in pull request #34701:
URL: https://github.com/apache/spark/pull/34701#discussion_r759945029
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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@@ -2162,6 +2163,74 @@ object RemoveLiteralFromGroupExpressions extends
Rule[LogicalPlan] {
}
}
+/**
+ * Prunes unnecessary fields from a [[Generate]] if it is under a count
aggregation
+ * query.
+ */
+object CountAggregateOptimization extends Rule[LogicalPlan] {
Review comment:
> also generally empty project cases.
Yea, and not only empty, e.g. `Project(1, child)` can also trigger the
optimization, as long as the Project has no references.
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