Github user marmbrus commented on a diff in the pull request: https://github.com/apache/spark/pull/11235#discussion_r53669872 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala --- @@ -57,6 +57,8 @@ abstract class Optimizer extends RuleExecutor[LogicalPlan] { ReplaceDistinctWithAggregate) :: Batch("Aggregate", FixedPoint(100), RemoveLiteralFromGroupExpressions) :: + Batch("Join", Once, + AddFilterOfNullForInnerJoin) :: --- End diff -- We should make this rule idempotent instead of hacking it and making it run only once. You are loosing the benefits of emergent optimizations with this implementation. I would directly construct the filter in the left/right child, but only when its not already present in the `constraints` of the child. This is the whole reason we added the ability to reason about what `constraints` are already present on a subtree.
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