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Liu 549bce6738 [ZEPPELIN-3014] NPE bug fix and Error message enhancement with Kylin Interpreter 
### What is this PR for?
A few sentences describing the overall goals of the pull request's commits.
First time? Check out the contributing guide - https://zeppelin.apache.org/contribution/contributions.html

### What type of PR is it?
Bug Fix

### Todos
* [ ] - Task

### What is the Jira issue?
* https://issues.apache.org/jira/browse/ZEPPELIN-3014

### How should this be tested?
*  Setup Travis CI as described on https://zeppelin.apache.org/contribution/contributions.html#continuous-integration
* Use existing unit tests in kylin module.

### Screenshots (if appropriate)

#### before: NPE when result set is empty
![image](https://user-images.githubusercontent.com/18542573/32154048-f1b8ba58-bcfb-11e7-98cc-98cdf484f2d5.png)
#### after: no NPE when result set is empty, just an empty table
![image](https://user-images.githubusercontent.com/18542573/32154069-110215d0-bcfc-11e7-87e9-cc049001f1c7.png)

#### before: when query fails, only error code is returned, no error message
![image](https://user-images.githubusercontent.com/18542573/32154088-29651938-bcfc-11e7-9e66-cd2cfccba054.png)
#### after: when query fails, both error code and error message are displayed to users
![image](https://user-images.githubusercontent.com/18542573/32154096-3d3ab01c-bcfc-11e7-8cf3-d710d96b8c5a.png)

### Questions:
* Does the licenses files need update? No.
* Is there breaking changes for older versions? No.
* Does this needs documentation? No.

Author: Liu <jinxliu@ebay.com>

Closes #2645 from jinxliu/kylin-intp-new and squashes the following commits:

d5692bf [Liu] refactor
85b6424 [Liu] add test for empty result set
4596470 [Liu] ZEPPELIN-3014: NPE bug fix and Error message enhancement with Kylin Interpreter
2017-12-13 18:54:06 +08:00
..
src [ZEPPELIN-3014] NPE bug fix and Error message enhancement with Kylin Interpreter 2017-12-13 18:54:06 +08:00
pom.xml ZEPPELIN-2982. Copy interpreter-setting.json to interpreter dir 2017-10-13 13:51:22 +08:00