Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/10399#discussion_r48114262
--- 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 --
Should we add a TODO to say that, we can remove this line after we hide the
`Decimal`? Logically `Decimal` is an internal concept and we should not expose
it to users.
cc @marmbrus @rxin
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