FailedChanges

Summary

  1. [SPARK-25760][SQL] Set AddJarCommand return empty (details)
Commit 1117fc35ff11ecc2873b4ec095ad243e8dcb5675 by dongjoon
[SPARK-25760][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
```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 spark-sql>
```
Closes #22747 from wangyum/AddJarCommand.
Authored-by: Yuming Wang <yumwang@ebay.com> Signed-off-by: Dongjoon Hyun
<dongjoon@apache.org>
The file was modifiedsql/core/src/main/scala/org/apache/spark/sql/execution/command/resources.scala (diff)