Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/4497#discussion_r24393934
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -602,6 +603,16 @@ object CombineLimits extends Rule[LogicalPlan] {
}
/**
+ * Combines two adjacent [[Cast]] expressions into one
+ */
+object CombineCasts extends Rule[LogicalPlan] {
+ def apply(plan: LogicalPlan): LogicalPlan = plan transformAllExpressions
{
+ case cc @ Cast(c2 @ Cast(c1, dataType1), dataType2) =>
--- End diff --
`cc` and `c2` is not used. You could just write `case Cast(Cast(c1,
dataType1), dataType2)`
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