viirya commented on PR #59334:
URL: https://github.com/apache/spark/pull/59334#issuecomment-6100496414

   Thanks for the thorough review, @dongjoon-hyun.
   
   - Large negative exponents (`'1e-2147483647'`, and the slow `'1e-10000000'`) 
and the legacy negative-scale conf: these fail in `changePrecision` (`setScale` 
with a huge scale delta), not in the fast-fail check this PR fixes. They are 
handled in #59335 (SPARK-60119), together with cast-level tests for both cases, 
so I kept this PR scoped to the fast-fail.
   - Zero: agreed, `'0e39'` returning NULL is the same false positive. The 
fast-fail now skips zero (`bigDecimal.signum != 0`), so `'0e2147483647'` keeps 
returning `0.00` and `'0e39'` is fixed. I updated the tests and the PR 
description.
   - `Decimal.set` L152 and the other `BigDecimal` entry points: filed 
SPARK-60132. For CSV/JSON the exception currently becomes a bad record rather 
than a task failure, but it should still be handled consistently.
   


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