Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/2368#discussion_r17524775
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -32,12 +32,12 @@ object Optimizer extends RuleExecutor[LogicalPlan] {
Batch("Combine Limits", FixedPoint(100),
CombineLimits) ::
Batch("ConstantFolding", FixedPoint(100),
+ SimplifyCasts,
--- End diff --
I'm inclined to leave it as it is. All of the rules in this batch are
optimizations, and thus it should be possible to apply them at anytime without
an exception being thrown. If there are other bugs with the casting operators
we should fix those instead of rearranging to mask the problem.
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