maropu commented on a change in pull request #31630:
URL: https://github.com/apache/spark/pull/31630#discussion_r581608222
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
##########
@@ -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:
hm, in this case, we need the join itself?
```
scala> sql("select * from l1").show()
+----+
| id|
+----+
| 1|
| 2|
|null|
+----+
scala> sql("select * from r1").show()
+----+
| id|
+----+
| 2|
|null|
+----+
scala> sql("select * from l1 left semi join r1").show()
+----+
| id|
+----+
| 1|
| 2|
|null|
+----+
scala> sql("select * from l1 left anti join r1").show()
+---+
| id|
+---+
+---+
```
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