Github user zhichao-li commented on a diff in the pull request:

    https://github.com/apache/spark/pull/10731#discussion_r49967047
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
 ---
    @@ -445,6 +445,26 @@ class Analyzer(
             val newOrdering = resolveSortOrders(ordering, child, throws = 
false)
             Sort(newOrdering, global, child)
     
    +     // Resolve the order index to be a specific column
    --- End diff --
    
    @yhuai  not sure if it's the style you prefer. mind giving suggestions? 


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