Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/23104#discussion_r236114751
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -459,6 +459,7 @@ object LimitPushDown extends Rule[LogicalPlan] {
val newJoin = joinType match {
case RightOuter => join.copy(right = maybePushLocalLimit(exp,
right))
case LeftOuter => join.copy(left = maybePushLocalLimit(exp, left))
+ case Cross => join.copy(left = maybePushLocalLimit(exp, left),
right = maybePushLocalLimit(exp, right))
--- End diff --
how about inner join without condition?
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