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https://issues.apache.org/jira/browse/FLINK-4517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15601123#comment-15601123
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ASF GitHub Bot commented on FLINK-4517:
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Github user shijinkui closed the pull request at:
https://github.com/apache/flink/pull/2428
> 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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