Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/12850#discussion_r65221659
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -742,6 +742,23 @@ object InferFiltersFromConstraints extends
Rule[LogicalPlan] with PredicateHelpe
* equivalent [[Literal]] values.
*/
object ConstantFolding extends Rule[LogicalPlan] {
+ private def isAssociativelyFoldable(e: Expression): Boolean =
--- End diff --
Similar to `ReorderJoin`, we should have a new rule
`ReorderAssociativeOperator` to do this optimization, instead of putting it in
`ConstantFolding`.
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