Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/20246#discussion_r161362196
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala
---
@@ -282,6 +282,8 @@ case class Cast(child: Expression, dataType: DataType,
timeZoneId: Option[String
builder.append("]")
builder.build()
})
+ case udt: UserDefinedType[_] =>
--- End diff --
I think we can strip UDT at L608 and fix this problem entirely.
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