Github user ravipesala commented on a diff in the pull request:
https://github.com/apache/carbondata/pull/1469#discussion_r153061073
--- Diff:
integration/spark-common/src/main/scala/org/apache/spark/util/CarbonReflectionUtils.scala
---
@@ -0,0 +1,90 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.util
+
+import java.util
+
+import scala.reflect.runtime._
+import scala.reflect.runtime.universe._
+
+import org.apache.spark.sql.catalyst.TableIdentifier
+import org.apache.spark.sql.catalyst.analysis.UnresolvedRelation
+import org.apache.spark.sql.catalyst.plans.logical.LogicalPlan
+
+import org.apache.carbondata.common.logging.LogServiceFactory
+
+/**
+ * Reflection APIs
+ */
+
+object CarbonReflectionUtils {
+
+ private val LOGGER =
LogServiceFactory.getLogService(this.getClass.getCanonicalName)
+
+ private val rm = universe.runtimeMirror(getClass.getClassLoader)
+
+ /**
+ * Returns the field val from a object through reflection.
+ * @param name - name of the field being retrieved.
+ * @param obj - Object from which the field has to be retrieved.
+ * @tparam T
+ * @return
+ */
+ def getField[T: TypeTag: reflect.ClassTag](name: String, obj: T): Any = {
+ val im = rm.reflect(obj)
+
+ im.symbol.typeSignature.members.find(
+ _.name.toString.equals(name)).map(
+ l => im.reflectField(l.asTerm).get.asInstanceOf[LogicalPlan]
+ ).getOrElse(null)
+ }
+
+ def hasField[T: TypeTag: reflect.ClassTag](name: String, obj: T):
Boolean = {
+ val hasField : Boolean = if
(typeOf[T].members.filter(!_.isMethod).toList.contains(name)) {
+ true
+ } else {
+ false
+ }
+ hasField
+ }
+
+ def getUnresolvedRelation(tableIdentifier: TableIdentifier,
+ tableAlias: Option[String] = None): UnresolvedRelation = {
+
+ val clazz =
Utils.classForName("org.apache.spark.sql.catalyst.analysis.UnresolvedRelation")
+ try {
+ // For 2.1
+ clazz.getDeclaredField("alias")
+ val ctor = clazz.getConstructors.head
+ ctor.setAccessible(true)
+ val unresolvedrelation = ctor
+ .newInstance(tableIdentifier,
+ tableAlias).asInstanceOf[UnresolvedRelation]
+ unresolvedrelation
+ } catch {
+ case ce: NoSuchFieldException =>
--- End diff --
Please check based on spark version, not through an exception.
---
