Github user mike0sv commented on a diff in the pull request:
https://github.com/apache/spark/pull/18488#discussion_r134478386
--- 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)
+ }
+
+ /** Returns a mapping from int to enum value for given enum type */
+ def enumDeserializer[T <: Enum[T]](enum: Class[T]): InternalRow => T = {
+ assert(enum.isEnum)
+ value: InternalRow =>
+ Enum.valueOf(enum, value.getUTF8String(0).toString)
--- End diff --
Enum.valueOf uses cached string->value map
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