[GitHub] [spark] maropu commented on a change in pull request #25242: [SPARK-28497][SQL] Disallow upcasting complex data types to string type

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maropu commented on a change in pull request #25242: [SPARK-28497][SQL] Disallow upcasting complex data types to string type
URL: https://github.com/apache/spark/pull/25242#discussion_r306781065
 
 

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 File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala
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 @@ -131,7 +131,8 @@ object Cast {
     case (from: DecimalType, to: NumericType) if from.isTighterThan(to) => true
     case (f, t) if legalNumericPrecedence(f, t) => true
     case (DateType, TimestampType) => true
-    case (_, StringType) => true
+    case (_: AtomicType, StringType) => true
+    case (_: CalendarIntervalType, StringType) => true
 
 Review comment:
   How about `UserDefinedType`?

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