Github user mike0sv commented on a diff in the pull request:
https://github.com/apache/spark/pull/18488#discussion_r134477280
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/JavaTypeInference.scala
---
@@ -345,6 +356,30 @@ object JavaTypeInference {
}
}
+ /** Returns a mapping from enum value to int for given enum type */
+ def enumSerializer[T <: Enum[T]](enum: Class[T]): T => UTF8String = {
+ assert(enum.isEnum)
+ inputObject: T =>
+ UTF8String.fromString(inputObject.name())
+ }
+
+ /** Returns value index for given enum type and value */
+ def serializeEnumName[T <: Enum[T]](enum: UTF8String, inputObject: T):
UTF8String = {
+
enumSerializer(Utils.classForName(enum.toString).asInstanceOf[Class[T]])(inputObject)
+ }
--- End diff --
Utils.classForName delegates to Class.forName, which operates on native
level, so additional optimizations like caching are not required
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