cloud-fan commented on code in PR #38799:
URL: https://github.com/apache/spark/pull/38799#discussion_r1046753470


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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala:
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@@ -146,7 +146,9 @@ abstract class Optimizer(catalogManager: CatalogManager)
         operatorOptimizationRuleSet: _*) ::
       Batch("Push extra predicate through join", fixedPoint,
         PushExtraPredicateThroughJoin,
-        PushDownPredicates) :: Nil
+        PushDownPredicates) ::
+      Batch("Insert window group limit", Once,
+        InsertWindowGroupLimit) :: Nil

Review Comment:
   is there a specific reason to put the rule here, instead of the very end of 
the optimizer? e.g., right before `Batch("User Provided Optimizers", 
fixedPoint, experimentalMethods.extraOptimizations: _*)` in ·SparkOptimizer·.



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