Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17568#discussion_r111677168
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -92,6 +92,7 @@ abstract class Optimizer(sessionCatalog: SessionCatalog,
conf: SQLConf)
CombineUnions,
// Constant folding and strength reduction
NullPropagation(conf),
+ EliminateMapObjects,
--- End diff --
we have a `Typed Filter Optimization` batch, rename it to `Object
expressions optimization` and move this rule there?
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