GitHub user VampireAchao edited a comment on the discussion: StreamPark 
code-style-and-quality Improve

For collection return values, unless there are special circumstances (such as 
needing thread safety), always return the interface.
  ○ For example, ArrayList returns List
  ○ HashMap returns Map
  ○ HashSet returns Set

GitHub link: 
https://github.com/apache/incubator-streampark/discussions/2915#discussioncomment-6623975

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