uros-db commented on code in PR #46599:
URL: https://github.com/apache/spark/pull/46599#discussion_r1612779931


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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala:
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@@ -279,6 +280,7 @@ abstract class Optimizer(catalogManager: CatalogManager)
       RewritePredicateSubquery.ruleName ::
       NormalizeFloatingNumbers.ruleName ::
       ReplaceUpdateFieldsExpression.ruleName ::
+      RewriteCollationJoin.ruleName ::

Review Comment:
   @cloud-fan should `RewriteCollationJoin` be a nonExcludable rule or not - 
not sure what's the convention here? since there is essentially no impact on 
correctness, I think we may remove it from `nonExcludableRules`



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