[jira] [Created] (FLINK-4517) scala code refactoring

[Shang Yuanchun (Jira)]

shijinkui created FLINK-4517:
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             Summary: scala code refactoring
                 Key: FLINK-4517
                 URL: https://issues.apache.org/jira/browse/FLINK-4517
             Project: Flink
          Issue Type: Improvement
            Reporter: shijinkui
            Priority: Minor


such as:
1. case class does't need `new`
2. case block does't need `{  ...  }`
3. match-case instead of isInstanceOf



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