jayzhan211 commented on PR #26211:
URL: https://github.com/apache/datafusion/pull/26211#issuecomment-6418663507

   The fuzz failure comes from the test data, not from this PR. The generator 
fills decimal columns with values that don't fit their precision (for example 
`693850995` in a `Decimal32(1, 0)` column). `sum` on `main` never checks 
precision, but the new CAST here does, so the baseline query errors. #26774 
makes the generator respect precision. With it, `test_sum` passed 20 of 20 runs 
on top of this PR (4 of 10 failed without it). Once it merges, this PR can go 
back into the merge queue.
   


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