Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/10399#issuecomment-199727758
> We can't bind `DecimalType` to two different types
Agree, but we can work around it by using `Object` as the external type for
`DecimalType`, and add comments to explain it can be java decimal or `Decimal`.
Then we just need to add `Decimal.apply(v: Any)`, what do you think?
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