Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/12719#discussion_r62410825
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -617,6 +618,77 @@ object NullPropagation extends Rule[LogicalPlan] {
}
/**
+ * Propagate foldable expressions:
+ * Replace all attributes with aliases of the original foldable
expressions except the followings.
+ * 1) Command and Set(UNION/INTERSECT/EXCEPT): Do not optimize.
--- End diff --
What will happen if we optimize them?
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