Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/10399#issuecomment-199693170
Because `externalDataTypeFor` is already binded `DecimalType` to
`java.math.BigDecimal`. Changing `RowEncoder.extractorsFor` can't make
RowEncoder support Decimal in external row.
In order to support this, we need to change `Invoke`.
@rxin @cloud-fan Please review this and let me know if it is good. Thanks!
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