liamzwbao opened a new pull request, #8552:
URL: https://github.com/apache/arrow-rs/pull/8552

   # 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.
   
   - Part of #8477.
   
   # Rationale for this change
   
   # What changes are included in this PR?
   
   - Support casting `Variant` → `Decimal32/64/128/256`
   - Handle scaling and precision adjustments, downscaling may lose fractional 
precision
   
   # Are these changes tested?
   
   Yes
   
   # Are there any user-facing changes?
   
   New cast types supported
   


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