GitHub user petermaxlee opened a pull request:

    https://github.com/apache/spark/pull/15123

    [SPARK-17551][SQL] Add DataFrame API for null ordering

    ## What changes were proposed in this pull request?
    This pull request adds Scala/Java DataFrame API for null ordering (NULLS 
FIRST | LAST).
    
    ## How was this patch tested?
    Added a new test case in DataFrameSuite.

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

    $ git pull https://github.com/petermaxlee/spark SPARK-17551

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

    https://github.com/apache/spark/pull/15123.patch

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

    This closes #15123
    
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commit 69a9d8aacb3832f3e346a7b9dbb13dc522e4dc68
Author: Xin Wu <xi...@us.ibm.com>
Date:   2016-09-15T04:12:43Z

    complete the NULL ordering support in DataFrame APIs

commit 90af6b87d6b677cd9b957c2faa18520e005d6001
Author: petermaxlee <petermax...@gmail.com>
Date:   2016-09-17T00:26:06Z

    Merge pull request #15107 from xwu0226/null_order
    
    [SPARK-17551][SQL] complete the NULL ordering support in DataFrame APIs

commit 02f5edf207e2d545a23f7c33d4f19ce8fc880041
Author: petermaxlee <petermax...@gmail.com>
Date:   2016-09-17T00:58:11Z

    Updated.

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