maropu commented on a change in pull request #31901:
URL: https://github.com/apache/spark/pull/31901#discussion_r598272364
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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@@ -70,10 +70,19 @@ abstract class Optimizer(catalogManager: CatalogManager)
def defaultBatches: Seq[Batch] = {
val operatorOptimizationRuleSet =
Seq(
- // Operator push down
- PushProjectionThroughUnion,
+ // Optimize join
ReorderJoin,
EliminateOuterJoin,
+ // Simplify expressions
+ BooleanSimplification,
+ SimplifyConditionals,
+ PushFoldableIntoBranches,
+ RemoveDispensableExpressions,
+ SimplifyBinaryComparison,
+ ReplaceNullWithFalseInPredicate,
+ SimplifyConditionalsInPredicate,
Review comment:
It seems the rules that simplify exprs still exist at the bottom (e.g.,
`SimplifyCasts` and `SimplifyExtractValueOps`. We don't need to move them, too?
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