Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/18813#discussion_r131794021
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/ScalaReflection.scala
---
@@ -62,7 +62,7 @@ object ScalaReflection extends ScalaReflection {
def dataTypeFor[T : TypeTag]: DataType = dataTypeFor(localTypeOf[T])
private def dataTypeFor(tpe: `Type`): DataType = {
--- End diff --
dataTypeFor can be called like this:
val TypeRef(_, _, Seq(optType)) = t
val unwrapped = UnwrapOption(dataTypeFor(optType), inputObject)
So we need to dealias it too.
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