Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/10399#discussion_r57001947
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/encoders/RowEncoder.scala
---
@@ -142,7 +142,9 @@ object RowEncoder {
case CalendarIntervalType => dt
case TimestampType => ObjectType(classOf[java.sql.Timestamp])
case DateType => ObjectType(classOf[java.sql.Date])
- case _: DecimalType => ObjectType(classOf[java.math.BigDecimal])
+ // In order to support both Decimal and java BigDecimal in external
row, we make this
+ // as java.lang.Object.
+ case _: DecimalType => ObjectType(classOf[java.lang.Object])
--- End diff --
`externalDataTypeFor` is also used in `constructorFor`, I think we should
create a `externalDataTypeForInput` that can handle decimal type specially and
use it in `extractorFor`.
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