cloud-fan commented on code in PR #46523:
URL: https://github.com/apache/spark/pull/46523#discussion_r1599396352
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sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/AQEPropagateEmptyRelation.scala:
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@@ -82,6 +82,21 @@ object AQEPropagateEmptyRelation extends
PropagateEmptyRelationBase {
case _ => false
}
+ // In AQE, query stage will be wrapped with LogicalQueryStage, if it's child
is
+ // BroadcastQueryStage and join other side is empty relation like the follow
plan:
+ // Join
+ // :- LocalTableScan <empty>, [a#23]
+ // +- LogicalQueryStage(_, BroadcastQueryStage)
+ // After AQEPropagateEmptyRelation, the plan will be
+ // Project
+ // +- LogicalQueryStage(_, BroadcastQueryStage)
+ // Then after LogicalQueryStageStrategy, will only remain
BroadcastQueryStage after project,
+ // the plan can't execute.
Review Comment:
how hard is it to return the original query plan? Seems not hard as we just
need to add a new `def returnSingleJoinSide` function in the base class, and
unwrap broadcast stage in the AQE rule.
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