andygrove commented on PR #6836:
URL: https://github.com/apache/arrow-rs/pull/6836#issuecomment-2518139003

   There is a regression in `test_cast_decimal128_to_decimal256_negative`. The 
new validation check is correctly throwing an error, but it looks like we also 
need to add this validation when creating decimal arrays since the current test 
is creating invalid arrays before the cast:
   
   ```rust
   let array = vec![Some(i128::MAX), Some(i128::MIN)];
   let input_decimal_array = create_decimal_array(array, 10, 3).unwrap();
   ```
   
   I would expect this to fail, so we probably need to add the same validation 
there.


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