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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