neilconway opened a new pull request, #10873:
URL: https://github.com/apache/arrow-rs/pull/10873

   # Which issue does this PR close?
   
   - Closes #10872.
   
   # Rationale for this change
   
   The Decimal256 branch of `array_from_json` didn't handle zeros correctly. It 
builds a little-endian two's-complement buffer as part of converting 
string-valued decimals into native Decimal256 values, but for `0` inputs 
exactly, it used the wrong fill bytes (it used `0xFF` instead of `0`). This 
lead to `0` being decoded as `-256`.
   
   # What changes are included in this PR?
   
   * Fix decoding bug (use `0` fill bytes for `0` input values)
   * Add unit test
   
   # Are these changes tested?
   
   Yes, new test added.
   
   # Are there any user-facing changes?
   
   No.
   


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