Github user hvanhovell commented on a diff in the pull request: https://github.com/apache/spark/pull/17433#discussion_r108127414 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala --- @@ -146,6 +141,11 @@ abstract class Optimizer(sessionCatalog: SessionCatalog, conf: CatalystConf) s.withNewPlan(newPlan) } } + + /** + * Override to provide additional rules for the operator optimization batch. --- End diff -- Anything in catalyst can be changed between spark versions. This hook included.
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