GitHub user wangyum opened a pull request:
https://github.com/apache/spark/pull/22747
[MINOR][SQL] Set AddJarCommand return empty
## What changes were proposed in this pull request?
Only `AddJarCommand` return `0`, the user will be confused about what it
means. This PR sets it to empty.
```sql
spark-sql> add jar
/Users/yumwang/spark/sql/hive/src/test/resources/TestUDTF.jar;
ADD JAR /Users/yumwang/spark/sql/hive/src/test/resources/TestUDTF.jar
0
spark-sql>
```
## How was this patch tested?
manual tests
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/wangyum/spark AddJarCommand
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/22747.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 #22747
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commit 0a5b0ddd6b17381b5ff9d2f0b4c437bdddd6c6a6
Author: Yuming Wang <yumwang@...>
Date: 2018-10-16T12:36:13Z
Fix AddJarCommand result
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