Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/8409#issuecomment-134491667
@davies When we performing an division for 2 decimals with type Decimal(38,
18), the result can be Decimal(77, 57), as @yhuai described above, this
probably causes problem when we try to get the `scale` value, if we try to
support the maximum value of a decimal, the best value for `scale` would be 0,
however, that's not what we want to for Decimal(1.234) / Decimal(1.235).
That's why I come with the idea to limit the maximum value for `scale` as
`18`. Not sure if you have any better idea.
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