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From jinfengni <...@git.apache.org>
Subject [GitHub] drill pull request #906: DRILL-5546: Handle schema change exception failure ...
Date Wed, 30 Aug 2017 05:41:00 GMT
Github user jinfengni commented on a diff in the pull request:

    https://github.com/apache/drill/pull/906#discussion_r135974133
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/project/ProjectRecordBatch.java
---
    @@ -768,4 +765,73 @@ else if (exprHasPrefix && refHasPrefix) {
           }
         }
       }
    +
    +  /**
    +   * handle FAST NONE specially when Project for query output. This happens when input
returns a
    +   * FAST NONE directly ( input does not return any batch with schema/data).
    +   *
    +   * Project operator has to return a batch with schema derived using the following 3
rules:
    +   *  Case 1:  *  ==>  expand into an empty list of columns.
    +   *  Case 2:  regular column reference ==> treat as nullable-int column
    +   *  Case 3:  expressions => Call ExpressionTreeMaterialization over an empty vector
contain.
    --- End diff --
    
    Done. 


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