Go through the context classloader when reflecting on user types in ScalaReflection

Replaced calls to `typeOf` with `typeTag[T].in(mirror)`. The shorter method assumes
all types can be found in the classloader that loaded scala-reflect (the primordial
classloader). This assumption is not valid in all contexts (sbt console, Eclipse launchers).

Fixed SPARK-5281

Author: dragos

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/ScalaReflection.scala

@@ -27,6 +27,7 @@ import org.apache.spark.sql.types._
  */
 object ScalaReflection extends ScalaReflection {
   val universe: scala.reflect.runtime.universe.type = scala.reflect.runtime.universe
+  val mirror: universe.Mirror = universe.runtimeMirror(Thread.currentThread().getContextClassLoader)
 }
 
 /**
@@ -36,6 +37,9 @@ trait ScalaReflection {
   /** The universe we work in (runtime or macro) */
   val universe: scala.reflect.api.Universe
 
+  /** The mirror used to access types in the universe */
+  val mirror: universe.Mirror
+
   import universe._
 
   // The Predef.Map is scala.collection.immutable.Map.
@@ -52,7 +56,19 @@ trait ScalaReflection {
 
   /** Returns a catalyst DataType and its nullability for the given Scala Type using reflection. */
   def schemaFor[T: TypeTag]: Schema =
-    ScalaReflectionLock.synchronized { schemaFor(typeOf[T]) }
+    ScalaReflectionLock.synchronized { schemaFor(localTypeOf[T]) }
+
+  /**
+   * Return the Scala Type for `T` in the current classloader mirror.
+   *
+   * Use this method instead of the convenience method `universe.typeOf`, which
+   * assumes that all types can be found in the classloader that loaded scala-reflect classes.
+   * That's not necessarily the case when running using Eclipse launchers or even
+   * Sbt console or test (without `fork := true`).
+   *
+   * @see SPARK-5281
+   */
+  private def localTypeOf[T: TypeTag]: `Type` = typeTag[T].in(mirror).tpe
 
   /** Returns a catalyst DataType and its nullability for the given Scala Type using reflection. */
   def schemaFor(tpe: `Type`): Schema = ScalaReflectionLock.synchronized {
@@ -67,25 +83,25 @@ trait ScalaReflection {
         val udt = Utils.classForName(className)
           .getAnnotation(classOf[SQLUserDefinedType]).udt().newInstance()
         Schema(udt, nullable = true)
-      case t if t <:< typeOf[Option[_]] =>
+      case t if t <:< localTypeOf[Option[_]] =>
         val TypeRef(_, _, Seq(optType)) = t
         Schema(schemaFor(optType).dataType, nullable = true)
       // Need to decide if we actually need a special type here.
-      case t if t <:< typeOf[Array[Byte]] => Schema(BinaryType, nullable = true)
-      case t if t <:< typeOf[Array[_]] =>
+      case t if t <:< localTypeOf[Array[Byte]] => Schema(BinaryType, nullable = true)
+      case t if t <:< localTypeOf[Array[_]] =>
         val TypeRef(_, _, Seq(elementType)) = t
         val Schema(dataType, nullable) = schemaFor(elementType)
         Schema(ArrayType(dataType, containsNull = nullable), nullable = true)
-      case t if t <:< typeOf[Seq[_]] =>
+      case t if t <:< localTypeOf[Seq[_]] =>
         val TypeRef(_, _, Seq(elementType)) = t
         val Schema(dataType, nullable) = schemaFor(elementType)
         Schema(ArrayType(dataType, containsNull = nullable), nullable = true)
-      case t if t <:< typeOf[Map[_, _]] =>
+      case t if t <:< localTypeOf[Map[_, _]] =>
         val TypeRef(_, _, Seq(keyType, valueType)) = t
         val Schema(valueDataType, valueNullable) = schemaFor(valueType)
         Schema(MapType(schemaFor(keyType).dataType,
           valueDataType, valueContainsNull = valueNullable), nullable = true)
-      case t if t <:< typeOf[Product] =>
+      case t if t <:< localTypeOf[Product] =>
         val formalTypeArgs = t.typeSymbol.asClass.typeParams
         val TypeRef(_, _, actualTypeArgs) = t
         val constructorSymbol = t.member(nme.CONSTRUCTOR)
@@ -107,19 +123,20 @@ trait ScalaReflection {
               schemaFor(p.typeSignature.substituteTypes(formalTypeArgs, actualTypeArgs))
             StructField(p.name.toString, dataType, nullable)
           }), nullable = true)
-      case t if t <:< typeOf[String] => Schema(StringType, nullable = true)
-      case t if t <:< typeOf[java.sql.Timestamp] => Schema(TimestampType, nullable = true)
-      case t if t <:< typeOf[java.sql.Date] => Schema(DateType, nullable = true)
-      case t if t <:< typeOf[BigDecimal] => Schema(DecimalType.Unlimited, nullable = true)
-      case t if t <:< typeOf[java.math.BigDecimal] => Schema(DecimalType.Unlimited, nullable = true)
-      case t if t <:< typeOf[Decimal] => Schema(DecimalType.Unlimited, nullable = true)
-      case t if t <:< typeOf[java.lang.Integer] => Schema(IntegerType, nullable = true)
-      case t if t <:< typeOf[java.lang.Long] => Schema(LongType, nullable = true)
-      case t if t <:< typeOf[java.lang.Double] => Schema(DoubleType, nullable = true)
-      case t if t <:< typeOf[java.lang.Float] => Schema(FloatType, nullable = true)
-      case t if t <:< typeOf[java.lang.Short] => Schema(ShortType, nullable = true)
-      case t if t <:< typeOf[java.lang.Byte] => Schema(ByteType, nullable = true)
-      case t if t <:< typeOf[java.lang.Boolean] => Schema(BooleanType, nullable = true)
+      case t if t <:< localTypeOf[String] => Schema(StringType, nullable = true)
+      case t if t <:< localTypeOf[java.sql.Timestamp] => Schema(TimestampType, nullable = true)
+      case t if t <:< localTypeOf[java.sql.Date] => Schema(DateType, nullable = true)
+      case t if t <:< localTypeOf[BigDecimal] => Schema(DecimalType.Unlimited, nullable = true)
+      case t if t <:< localTypeOf[java.math.BigDecimal] =>
+        Schema(DecimalType.Unlimited, nullable = true)
+      case t if t <:< localTypeOf[Decimal] => Schema(DecimalType.Unlimited, nullable = true)
+      case t if t <:< localTypeOf[java.lang.Integer] => Schema(IntegerType, nullable = true)
+      case t if t <:< localTypeOf[java.lang.Long] => Schema(LongType, nullable = true)
+      case t if t <:< localTypeOf[java.lang.Double] => Schema(DoubleType, nullable = true)
+      case t if t <:< localTypeOf[java.lang.Float] => Schema(FloatType, nullable = true)
+      case t if t <:< localTypeOf[java.lang.Short] => Schema(ShortType, nullable = true)
+      case t if t <:< localTypeOf[java.lang.Byte] => Schema(ByteType, nullable = true)
+      case t if t <:< localTypeOf[java.lang.Boolean] => Schema(BooleanType, nullable = true)
       case t if t <:< definitions.IntTpe => Schema(IntegerType, nullable = false)
       case t if t <:< definitions.LongTpe => Schema(LongType, nullable = false)
       case t if t <:< definitions.DoubleTpe => Schema(DoubleType, nullable = false)