GitHub user davies opened a pull request:

    [SPARK-17863]  [SQL] should not add column into Distinct

    ## What changes were proposed in this pull request?
    We are trying to resolve the attribute in sort by pulling up some column 
for grandchild into child, but that's wrong when the child is Distinct, because 
the added column will change the behavior of Distinct, we should not do that. 
    ## How was this patch tested?
    Added regression test.

You can merge this pull request into a Git repository by running:

    $ git pull order_distinct

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #15489
commit 961c06277a4cebd9869344ecb1b58d3d571d2c89
Author: Davies Liu <>
Date:   2016-10-14T19:10:04Z

    should not add column into Distinct


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