Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/19362#discussion_r141403817
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -136,6 +134,8 @@ abstract class Optimizer(sessionCatalog: SessionCatalog)
Batch("LocalRelation", fixedPoint,
ConvertToLocalRelation,
PropagateEmptyRelation) ::
+ Batch("Check Cartesian Products", Once,
--- End diff --
we should also add a comment here about the positioning ...
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