GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/12376
[SPARK-14614] Add `bround` function
## What changes were proposed in this pull request?
This PR aims to add `bound` function (aka Banker's round) by extending
current `round` implementation. [Hive supports `bround` since
1.3.0.](https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF)
**Hive (1.3 ~ 2.0)**
```
hive> select round(2.5), bround(2.5);
OK
3.0 2.0
```
**After this PR**
```scala
scala> sql("select round(2.5), bround(2.5)").head
res0: org.apache.spark.sql.Row = [3,2]
```
## How was this patch tested?
Pass the Jenkins tests (with extended tests).
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-14614
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12376.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 #12376
----
commit 2950339c7a3cde53823f9d5fcafdbbe5b27f9549
Author: Dongjoon Hyun <[email protected]>
Date: 2016-04-13T23:08:14Z
[SPARK-14614] Add bround function
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