Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/990#discussion_r13530208
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -288,3 +293,18 @@ object SimplifyCasts extends Rule[LogicalPlan] {
case Cast(e, dataType) if e.dataType == dataType => e
}
}
+
+/**
+ * Removes the inner [[catalyst.expressions.CaseConversionExpression]]
that are unnecessary because
+ * the inner conversion is overwritten by the outer one.
+ */
+object SimplifyCaseConversionExpressions extends Rule[LogicalPlan] {
+ def apply(plan: LogicalPlan): LogicalPlan = plan transform {
+ case q: LogicalPlan => q transformExpressionsUp {
--- End diff --
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