Github user mgaido91 commented on the issue:
https://github.com/apache/spark/pull/22494
>The problem is, when users hit SPARK-25454, they must turn off both the
DECIMAL_OPERATIONS_ALLOW_PREC_LOSS and the new config.
If a user hits SPARK-25454, the value of
`DECIMAL_OPERATIONS_ALLOW_PREC_LOSS` is not relevant.
> The only reason to turn it off is: we hit SPARK-25454
No if SPARK-25454, turning it off is helpless. The only reason to turn it
off is to get `null` instead of facing a precision loss when we need a
precision higher than 38 and a scale higher than 6.
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