GitHub user liancheng opened a pull request:
https://github.com/apache/spark/pull/14334
[MINOR][SQL] Fixes window specification SQL format
## What changes were proposed in this pull request?
This PR fixes a minor formatting issue of `WindowSpecDefinition.sql` when
no partitioning expressions are present.
Before:
```sql
( ORDER BY `a` ASC ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW)
```
After:
```sql
(ORDER BY `a` ASC ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW)
```
## How was this patch tested?
New test case added in `ExpressionSQLBuilderSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/liancheng/spark window-spec-sql-format
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14334.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 #14334
----
commit 98355694c3ccdfc92a3df086adfd818f89394ec9
Author: Cheng Lian <[email protected]>
Date: 2016-07-24T13:23:21Z
Fixes window specification SQL format
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