Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/18576#discussion_r126345144
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -132,7 +132,9 @@ abstract class Optimizer(sessionCatalog: SessionCatalog)
OptimizeCodegen) ::
Batch("RewriteSubquery", Once,
RewritePredicateSubquery,
- CollapseProject) :: Nil
+ CollapseProject) ::
+ Batch("UpdateAttributeReferences", Once,
--- End diff --
The original motivation is to fix nullability inconsistency in logical
plans and I couldn't find concrete examples to make the optimization better by
using this new rule. Any idea?
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