[GitHub] drill pull request #844: DRILL-5538: Create TopProject with validatedNodeTyp...

[jinfengni <gi...@git.apache.org>]

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

    https://github.com/apache/drill/pull/844#discussion_r123632779
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/planner/sql/handlers/DefaultSqlHandler.java ---
    @@ -459,7 +468,13 @@ protected Prel convertToPrel(RelNode drel) throws RelConversionException, SqlUns
         /* The order of the following transformations is important */
     
         /*
    -     * 0.) For select * from join query, we need insert project on top of scan and a top project just
    +     * 0.)
    +     * Add top project before screen operator or writer to ensure that final output column names are preserved.
    +     */
    +    phyRelNode = TopProjectVisitor.insertTopProject(phyRelNode, validatedRowType);
    --- End diff --
    
    Make sense to me that you put this Visitor handling first, after physical transform() call, before these existing visitor handling.  


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