Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/20306#discussion_r162263815
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala
---
@@ -838,6 +839,7 @@ case class Cast(child: Expression, dataType: DataType,
timeZoneId: Option[String
|$evPrim = $buffer.build();
""".stripMargin
}
+ case pudt: PythonUserDefinedType => castToStringCode(pudt.sqlType,
ctx)
--- End diff --
The second one (Deserializing the catalyst value to customer object and
call toString). See:
https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala#L286
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