fixed error with orc data source actually

Author: JDrit

sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/ddl.scala

@@ -196,25 +196,25 @@ private[sql] class DDLParser(
 
 private[sql] object ResolvedDataSource extends Logging {
 
-  private lazy val loader = Utils.getContextOrSparkClassLoader
-  private lazy val serviceLoader = ServiceLoader.load(classOf[DataSourceRegister], loader)
-
   /** Tries to load the particular class */
-  private def tryLoad(provider: String): Option[Class[_]] = try {
+  private def tryLoad(loader: ClassLoader, provider: String): Option[Class[_]] = try {
     Some(loader.loadClass(provider))
   } catch {
     case cnf: ClassNotFoundException => None
   }
 
   /** Given a provider name, look up the data source class definition. */
   def lookupDataSource(provider: String): Class[_] = {
+    val loader = Utils.getContextOrSparkClassLoader
+    val serviceLoader = ServiceLoader.load(classOf[DataSourceRegister], loader)
+
     serviceLoader.iterator().filter(_.format() == provider).toList match {
-      case Nil => tryLoad(provider).orElse(tryLoad(s"$provider.DefaultSource")).getOrElse(
-        if (provider.startsWith("org.apache.spark.sql.hive.orc")) {
-          sys.error("The ORC data source must be used with Hive support enabled.")
-        } else {
-          sys.error(s"Failed to load class for data source: $provider")
-        })
+      case Nil => tryLoad(loader, provider).orElse(tryLoad(loader, s"$provider.DefaultSource"))
+        .getOrElse(if (provider.startsWith("org.apache.spark.sql.hive.orc")) {
+            sys.error("The ORC data source must be used with Hive support enabled.")
+          } else {
+            sys.error(s"Failed to load class for data source: $provider")
+          })
       case head :: Nil => head.getClass
       case sources => sys.error(s"Multiple sources found for $provider, " +
         s"(${sources.map(_.getClass.getName).mkString(", ")}), " +