GitHub user wangyum opened a pull request:
https://github.com/apache/spark/pull/18106
[SPARK-20754][SQL] Support TRUNC (number)
## What changes were proposed in this pull request?
Add support for `TRUNC(number)`, it's similar to Oracle
[TRUNC(number)](https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions200.htm):
```sql
> SELECT TRUNC(1234567891.1234567891, 4);
1.2345678911234E9
> SELECT TRUNC(1234567891.1234567891, -4);
1.23456E9
> SELECT TRUNC(1234567891.1234567891, 0);
1.234567891E9
> SELECT TRUNC(1234567891.1234567891);
1.234567891E9
```
## 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-20754-trunc
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18106.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 #18106
----
commit a5ade70afe7601db16ec24956f270feb4499ee42
Author: Yuming Wang <wgy...@gmail.com>
Date: 2017-05-25T10:21:15Z
Support TRUNC (number)
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