Github user chenghao-intel commented on a diff in the pull request: https://github.com/apache/spark/pull/2368#discussion_r17525387 --- 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 just added an new unit test ```SELECT CAST(CAST('123' AS binary) AS binary) FROM src LIMIT 1```, this test will fail because the `ConstantFolding` will try to compute the `foldable` expression prior to `SimplifyCasts`. Sorry, I should add this test case earlier.
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