Major Description
Kylin developers use both intellij and eclipse. The two IDE's different behaviors to formatting java code are leading to a lot of unnecessary diff/conflicts when when merging codes. This ticket is to ensure we have unified java code style afterwards.
Current approach:
1. Use in-project eclipse format as standard
2. Intellj users should align with the style by using the plugin: eclipse code formatter.
3. (Optional) enforce code style checking by maven checkstyle