bowenliang123 opened a new pull request, #4959:
URL: https://github.com/apache/kyuubi/pull/4959
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### _Why are the changes needed?_
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1. If you add a feature, you can talk about the use case of it.
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- To improve Scala code with corrections, simplification, scala style,
redundancy cleaning-up. No feature changes were introduced.
Corrections:
- Class doesn't correspond to file name
- Correct package name
Improvements:
- 'var' could be a 'val'
- GetOrElse(null) to orNull
Cleanup & Simplification:
- Redundant cast inspection
- Redundant collection conversion
- Simplify boolean expression
- Redundant new on case class
- Redundant return
- Unnecessary parentheses
- Unnecessary partial function
- Simplifiable empty check
Scala Style:
- Constructing range for seq indices
- Get and getOrElse to getOrElse
- Convert expression to Single Abstract Method (SAM)
- Scala unnecessary semicolon inspection
- Map and getOrElse(false) to exists
- Map and flatten to flatMap
- Null initializer can be replaced by _
Other Improvements:
- Replace map and getOrElse(true) with forall
- Unit return type in the argument of map
- Size to length on arrays and strings
- Type check can be pattern matching
- Java mutator method accessed as parameterless
- Procedure syntax in method definition
### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including
negative and positive cases if possible
- [ ] Add screenshots for manual tests if appropriate
- [ ] [Run
test](https://kyuubi.readthedocs.io/en/master/develop_tools/testing.html#running-tests)
locally before make a pull request
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