[GitHub] [incubator-doris] wangbo commented on pull request #6253: [Improvement][Vectorized] Lower/upper case tranfer function vertorized

[GitBox <gi...@apache.org>]

wangbo commented on pull request #6253:
URL: https://github.com/apache/incubator-doris/pull/6253#issuecomment-881834833


   This pr refers to Clickhouse's Function implementation.
   So I think it's better to indicate the source.
   Then explain whether you have done any optimization or some customized for Doris's case.
   You can see ```bitmap_value.h``` 's comment.


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