cloud-fan commented on code in PR #36417:
URL: https://github.com/apache/spark/pull/36417#discussion_r866649081
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala:
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@@ -750,6 +749,11 @@ object LimitPushDown extends Rule[LogicalPlan] {
Limit(le, Project(a.aggregateExpressions, LocalLimit(le, a.child)))
case Limit(le @ IntegerLiteral(1), p @ Project(_, a: Aggregate)) if
a.groupOnly =>
Limit(le, p.copy(child = Project(a.aggregateExpressions, LocalLimit(le,
a.child))))
+ // Merge offset value and limit value into LocalLimit and pushes down
LocalLimit through Offset.
+ case LocalLimit(le, Offset(oe @ IntegerLiteral(offset), grandChild)) if
offset > 0 =>
Review Comment:
I think the pushdown is correct even if `offset == 0`. We don't need `if
offset > 0`
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