Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/22450
I feel there are more places we need to fix for negative scale. I couldn't
find any design doc for negative scale in Spark and I believe we supported it
by accident.
That said, fixing division is just fixing the specific case the user
reported, which is not ideal. We should either officially support negative
scale and fix all the cases, or officially forbid negative scale. However,
neither of them can be made into a bug fix for branch 2.3 and 2.4.
Instead, I'm proposing a different fix: un-officially forbids negative
scale. Users can still create a decimal value with negative scale, but Spark
itself should avoid generating such values. See
https://github.com/apache/spark/pull/22470
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