HaoYang670 opened a new pull request, #1739:
URL: https://github.com/apache/arrow-rs/pull/1739

   Signed-off-by: remzi <[email protected]>
   
   # Which issue does this PR close?
   
   <!---
   We generally require a GitHub issue to be filed for all bug fixes and 
enhancements and this helps us generate change logs for our releases. You can 
link an issue to this PR using the GitHub syntax. For example `Closes #123` 
indicates that this PR will close issue #123.
   -->
   
   Closes #1737.
   
   # Rationale for this change
    1. More user-friendly: expose the type of `null_bit_buffer`
    2. Maybe faster: avoid some useless pattern matching
    3. fewer `mut`s are better
   
   # What changes are included in this PR?
   Change the type of `buf` from `Buffer` to `Option<Buffer>`
   <!---
   There is no need to duplicate the description in the issue here but it is 
sometimes worth providing a summary of the individual changes in this PR.
   -->
   
   # Are there any user-facing changes?
   Yes!
   


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