Update sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala

Co-authored-by: Wenchen Fan <[email protected]>

Author: wangyum

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala

@@ -647,7 +647,7 @@ object LimitPushDown extends Rule[LogicalPlan] {
     // There is a Project between LocalLimit and Join if they do not have the same output.
     case LocalLimit(exp, project @ Project(_, join: Join)) =>
       LocalLimit(exp, project.copy(child = pushLocalLimitThroughJoin(exp, join)))
-    // Push down limit 1 and turn Aggregate into Project through Aggregate if it is group only.
+    // 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)))
     case Limit(le @ IntegerLiteral(1), p @ Project(_, a: Aggregate)) if a.groupOnly =>