cloud-fan commented on a change in pull request #32602:
URL: https://github.com/apache/spark/pull/32602#discussion_r637769900
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/PropagateEmptyRelation.scala
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@@ -137,3 +149,53 @@ object PropagateEmptyRelation extends Rule[LogicalPlan]
with PredicateHelper wit
}
}
}
+
+/**
+ * Rule [[PropagateEmptyRelationBase]] at normal optimizer side.
+ * With the extra optimal pattern:
+ * 1. Higher-node Logical Plans
+ * - Union with all empty children.
+ * 2. Unary-node Logical Plans
+ * - Project/Filter/Sample with all empty children.
+ */
+object PropagateEmptyRelation extends PropagateEmptyRelationBase {
+ private def propagateEmptyRelationBasic: PartialFunction[LogicalPlan,
LogicalPlan] = {
Review comment:
nit: `applyFunc`
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