[jira] [Created] (SPARK-17248) Add native Scala enum support to Dataset Encoders

["Silvio Fiorito (JIRA)" <ji...@apache.org>]

Silvio Fiorito created SPARK-17248:
--------------------------------------

             Summary: Add native Scala enum support to Dataset Encoders
                 Key: SPARK-17248
                 URL: https://issues.apache.org/jira/browse/SPARK-17248
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.0.0
            Reporter: Silvio Fiorito


Enable support for Scala enums in Encoders. Ideally, users should be able to use enums as part of case classes automatically.

Currently, this code...

{code}
object MyEnum extends Enumeration {
  type MyEnum = Value
  val EnumVal1, EnumVal2 = Value
}

case class MyClass(col: MyEnum.MyEnum)

val data = Seq(MyClass(MyEnum.EnumVal1), MyClass(MyEnum.EnumVal2)).toDS()
{code}

...results in this stacktrace:

{code}
ava.lang.UnsupportedOperationException: No Encoder found for MyEnum.MyEnum
- field (class: "scala.Enumeration.Value", name: "col")
- root class: "line550c9f34c5144aa1a1e76bcac863244717.$read.$iwC.$iwC.$iwC.$iwC.MyClass"
	at org.apache.spark.sql.catalyst.ScalaReflection$.org$apache$spark$sql$catalyst$ScalaReflection$$serializerFor(ScalaReflection.scala:598)
	at org.apache.spark.sql.catalyst.ScalaReflection$$anonfun$9.apply(ScalaReflection.scala:592)
	at org.apache.spark.sql.catalyst.ScalaReflection$$anonfun$9.apply(ScalaReflection.scala:583)
	at scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:251)
	at scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:251)
	at scala.collection.immutable.List.foreach(List.scala:318)
	at scala.collection.TraversableLike$class.flatMap(TraversableLike.scala:251)
	at scala.collection.AbstractTraversable.flatMap(Traversable.scala:105)
	at org.apache.spark.sql.catalyst.ScalaReflection$.org$apache$spark$sql$catalyst$ScalaReflection$$serializerFor(ScalaReflection.scala:583)
	at org.apache.spark.sql.catalyst.ScalaReflection$.serializerFor(ScalaReflection.scala:425)
	at org.apache.spark.sql.catalyst.encoders.ExpressionEncoder$.apply(ExpressionEncoder.scala:61)
	at org.apache.spark.sql.Encoders$.product(Encoders.scala:274)
	at org.apache.spark.sql.SQLImplicits.newProductEncoder(SQLImplicits.scala:47)
{code}



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