peter-toth commented on code in PR #37334:
URL: https://github.com/apache/spark/pull/37334#discussion_r934285266
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala:
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@@ -568,9 +581,6 @@ object RemoveRedundantAliases extends Rule[LogicalPlan] {
newChild
}
- // Create the attribute mapping. Note that the currentNextAttrPairs
can contain duplicate
- // keys in case of Union (this is caused by the
PushProjectionThroughUnion rule); in this
- // case we use the first mapping (which should be provided by the
first child).
Review Comment:
added in
https://github.com/apache/spark/pull/37334/commits/11020eee40af3e1d513b393e33509b13bf6e432c
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