GitHub user uncleGen opened a pull request:
https://github.com/apache/spark/pull/16096
[SPARK-18617][BACKPORT] backport to branch-2.0
## What changes were proposed in this pull request?
backport #16052 to branch-2.0 with incremental update in #16091
## How was this patch tested?
new unit test
cc @zsxwing @rxin
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/uncleGen/spark branch-2.0-SPARK-18617
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16096.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 #16096
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commit 76e01432398295f8c48606dbba4847eede3815a2
Author: uncleGen <husty...@gmail.com>
Date: 2016-12-01T05:07:59Z
backport to branch-2.0
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