Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/21822#discussion_r204955869
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -787,6 +782,7 @@ class Analyzer(
right
case Some((oldRelation, newRelation)) =>
val attributeRewrites =
AttributeMap(oldRelation.output.zip(newRelation.output))
+ // TODO(rxin): Why do we need transformUp here?
--- End diff --
@cloud-fan ?
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