cloud-fan commented on a change in pull request #32602:
URL: https://github.com/apache/spark/pull/32602#discussion_r637850462
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/PropagateEmptyRelation.scala
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@@ -137,3 +127,54 @@ object PropagateEmptyRelation extends Rule[LogicalPlan]
with PredicateHelper wit
}
}
}
+
+/**
+ * Rule [[PropagateEmptyRelationBase]] at normal optimizer side with the extra
pattern:
Review comment:
```
This rule runs in the normal optimizer and optimizes more cases
compared to [[PropagateEmptyRelationBase]]:
...
```
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