Github user yanboliang commented on the issue:

    https://github.com/apache/spark/pull/16516
  
    @imatiach-msft I think not all string params should be case-insensitive, 
such as:
    * All column name params should not case-insensitive, like ```inputCol```.
    * Param names which were composed by multiple words, like 
```areaUnderROC```.
    
    Please see the PR description.
    
    And for lots of other string params that you searched out, like 
```impurity```, are already case-insensitive.
    Other string params, like ```SQLTransformer.statement```, are not need to 
be updated, since they are not set with a string word. The backend Spark SQL 
engine will handle all kinds of SQL statements.


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