Github user rxin commented on a diff in the pull request:

    https://github.com/apache/spark/pull/21822#discussion_r204160150
  
    --- 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 --
    
    cc @cloud-fan why do we need transformUp here?


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