Github user yhuai commented on the issue:
https://github.com/apache/spark/pull/14439
Let's be careful at here. I am not sure we can just use
`DecimalPrecision.widerDecimalType`, which produces `Decimal(38, 38)` when we
have one decimal with the type of `Decimal(38, 0)` and another one with the
type of `Decimal(38, 38)`.
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