GitHub user wangyum opened a pull request:
https://github.com/apache/spark/pull/18173
[SPARK-20948][SQL] Built-in SQL Function UnaryMinus/UnaryPositive support
string type
## What changes were proposed in this pull request?
Built-in SQL Function UnaryMinus/UnaryPositive support string type, if it's
string type, convert it to double type, after this PR:
```sql
spark-sql> select positive('-1.11'), negative('-1.11');
-1.11 1.11
spark-sql>
```
## 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-20948
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18173.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 #18173
----
commit 5e7ed08c3c6f80d2d3ebbef0922987270a35aa4c
Author: Yuming Wang <[email protected]>
Date: 2017-06-01T08:14:45Z
UnaryMinus/UnaryPositive function support string type.
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