maropu commented on a change in pull request #31630:
URL: https://github.com/apache/spark/pull/31630#discussion_r581895389
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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@@ -555,6 +559,8 @@ object LimitPushDown extends Rule[LogicalPlan] {
join.copy(
left = maybePushLocalLimit(exp, left),
right = maybePushLocalLimit(exp, right))
+ case LeftSemi | LeftAnti if conditionOpt.isEmpty =>
+ join.copy(left = maybePushLocalLimit(exp, left))
Review comment:
> Similarly for LEFT ANTI join without condition, we can convert join
logical plan node to an empty relation if right build side is not empty. Will
submit a followup PR tomorrow.
Ah, I see. That sounds reasonable. Nice idea, @c21 .
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