wangyum commented on PR #40462:
URL: https://github.com/apache/spark/pull/40462#issuecomment-1487849388
How about reverting this PR directly? Otherwise, we need to change
`LimitPushDown`, which is not elegant:
```scala
case Limit(exp, u: Union) if
u.children.exists(_.isInstanceOf[HasPartitionExpressions]) =>
val newChildren = u.children.map {
case r: RebalancePartitions =>
maybePushLocalLimit(exp, r.child)
case r: RepartitionByExpression
if r.partitionExpressions.nonEmpty &&
r.partitionExpressions.forall(_.deterministic) =>
maybePushLocalLimit(exp, r.child)
case o =>
maybePushLocalLimit(exp, o)
}
Limit(exp, u.copy(children = newChildren))
```
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