Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/10283#discussion_r47506409
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/ScalaReflection.scala
---
@@ -61,6 +61,7 @@ object ScalaReflection extends ScalaReflection {
case t if t <:< definitions.ByteTpe => ByteType
case t if t <:< definitions.BooleanTpe => BooleanType
case t if t <:< localTypeOf[Array[Byte]] => BinaryType
+ case t if t <:< localTypeOf[Decimal] => DecimalType.SYSTEM_DEFAULT
--- End diff --
Yes. `constructorFor` will call `dataTypeFor` to determine if a type is
`ObjectType` or not. If there is not case for `Decimal`, it will be recognized
as `ObjectType` and causes bug.
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