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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