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[SPARK-36183][SQL][FOLLOWUP] Fix push down limit 1 through Aggregate #35286

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[SPARK-36183][SQL][FOLLOWUP] Fix push down limit 1 through Aggregate #35286

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4 changes: 2 additions & 2 deletions sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -721,9 +721,9 @@ object LimitPushDown extends Rule[LogicalPlan] {
LocalLimit(exp, project.copy(child = pushLocalLimitThroughJoin(exp, join)))
// Push down limit 1 through Aggregate and turn Aggregate into Project if it is group only.
case Limit(le @ IntegerLiteral(1), a: Aggregate) if a.groupOnly =>
Limit(le, Project(a.output, LocalLimit(le, a.child)))
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.output, LocalLimit(le, a.child))))
Limit(le, p.copy(child = Project(a.aggregateExpressions, LocalLimit(le, a.child))))
}
}

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7 changes: 7 additions & 0 deletions sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/LimitPushdownSuite.scala
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Expand Up @@ -254,6 +254,13 @@ class LimitPushdownSuite extends PlanTest {
Optimize.execute(x.union(y).groupBy("x.a".attr)("x.a".attr).limit(1).analyze),
LocalLimit(1, LocalLimit(1, x).union(LocalLimit(1, y))).select("x.a".attr).limit(1).analyze)

comparePlans(
Optimize.execute(
x.groupBy("x.a".attr)("x.a".attr)
.select("x.a".attr.as("a1"), "x.a".attr.as("a2")).limit(1).analyze),
LocalLimit(1, x).select("x.a".attr)
.select("x.a".attr.as("a1"), "x.a".attr.as("a2")).limit(1).analyze)

// No push down
comparePlans(
Optimize.execute(x.groupBy("x.a".attr)("x.a".attr).limit(2).analyze),
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