GitHub user wangyum opened a pull request:
https://github.com/apache/spark/pull/18833
[SPARK-21625][SQL] sqrt(negative number) should be null.
## What changes were proposed in this pull request?
This PR makes `sqrt(negative number)` to null, same as Hive and MySQL.
## How was this patch tested?
unit tests
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/wangyum/spark SPARK-21625
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18833.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 #18833
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commit f346f5b240f20b653d4a2c6eaf11660f7f7ff98b
Author: Yuming Wang <wgy...@gmail.com>
Date: 2017-08-03T08:43:52Z
sqrt function deal with negative number.
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