c21 commented on a change in pull request #31630:
URL: https://github.com/apache/spark/pull/31630#discussion_r581612766
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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:
I think we still need. Whether to output all rows or nothing, is
depending on whether right side is empty, and this can only be known during
runtime.
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