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[SPARK-27815][SQL][FOLLOWUP][DOC] Update comment that references PushDownPredicate #25207

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[SPARK-27815][SQL][FOLLOWUP][DOC] Update comment that references PushDownPredicate #25207

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2 changes: 1 addition & 1 deletion sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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Expand Up @@ -487,7 +487,7 @@ object LimitPushDown extends Rule[LogicalPlan] {
* Union:
* Right now, Union means UNION ALL, which does not de-duplicate rows. So, it is
* safe to pushdown Filters and Projections through it. Filter pushdown is handled by another
* rule PushDownPredicate. Once we add UNION DISTINCT, we will not be able to pushdown Projections.
* rule PushDownPredicates. Once we add UNION DISTINCT, we will not be able to pushdown Projections.
*/
object PushProjectionThroughUnion extends Rule[LogicalPlan] with PredicateHelper {

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