GitHub user xwu0226 opened a pull request:
https://github.com/apache/spark/pull/15107
[SPARK-17551][SQL] complete the NULL ordering support in DataFrame APIs
## What changes were proposed in this pull request?
This PR is to complete the feature - NULLS FIRST | LAST in sorting for
DataFrame/Dataset APIs.
## How was this patch tested?
New DataFrame test case are added.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/xwu0226/spark null_order
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15107.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 #15107
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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
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