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Posted to reviews@spark.apache.org by mgaido91 <gi...@git.apache.org> on 2018/08/06 11:31:07 UTC

[GitHub] spark pull request #21184: [WIP][SPARK-24051][SQL] Replace Aliases with the ...

Github user mgaido91 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/21184#discussion_r207859370
  
    --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala ---
    @@ -284,6 +288,80 @@ class Analyzer(
         }
       }
     
    +  /**
    +   * Replaces [[Alias]] with the same exprId but different references with [[Alias]] having
    +   * different exprIds. This is a rare situation which can cause incorrect results.
    +   */
    +  object DeduplicateAliases extends Rule[LogicalPlan] {
    --- End diff --
    
    kindly ping @cloud-fan 


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