GitHub user wangyum opened a pull request:
https://github.com/apache/spark/pull/18153
[SPARK-20931][SQL] ABS function support string type.
## What changes were proposed in this pull request?
ABS function support string type. Hive/MySQL support this feature.
Ref:
https://github.com/apache/hive/blob/4ba713ccd85c3706d195aeef9476e6e6363f1c21/ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDFAbs.java#L93
## 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-20931
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18153.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 #18153
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commit 209dbaf07ed93bdd66d89b0bc45ebdd898632e27
Author: Yuming Wang <wgy...@gmail.com>
Date: 2017-05-31T03:40:19Z
ABS function support string type.
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