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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