Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/10399#issuecomment-199706699
I did originally have the same idea. However, it can't. Because for each
field in a external row, `Invoke(inputObject, method,
externalDataTypeFor(f.dataType)` will be called to get the value from row and
use correct type. Here `externalDataTypeFor` will return
`ObjectType(classOf[java.math.BigDecimal])
` for `DecimalType`. We can't bind `DecimalType` to two different types.
In other words, for each data type, we assume the corresponding value is in
specified object type.
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