Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/9840#discussion_r45769130
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/encoders/ExpressionEncoder.scala
---
@@ -235,12 +236,13 @@ case class ExpressionEncoder[T](
val plan = Project(Alias(unbound, "")() :: Nil, LocalRelation(schema))
val analyzedPlan = SimpleAnalyzer.execute(plan)
+ val optimizedPlan = SimplifyCasts(analyzedPlan)
--- End diff --
I wonder if we should just use the full optimizer here. I guess for now it
won't do anything, but since it should never change the answer and we might
improve it later that might make more sense.
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