Github user sounakr commented on a diff in the pull request:
https://github.com/apache/carbondata/pull/1469#discussion_r153096083
--- Diff:
integration/spark2/src/main/scala/org/apache/spark/util/CarbonClassReflectionUtils.scala
---
@@ -0,0 +1,186 @@
+/*
+ * 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.sql
+
+import scala.reflect.runtime._
+import scala.reflect.runtime.universe._
+
+import org.apache.spark.SparkContext
+import org.apache.spark.sql.catalyst.TableIdentifier
+import org.apache.spark.sql.catalyst.analysis.UnresolvedRelation
+import org.apache.spark.sql.catalyst.parser.AstBuilder
+import org.apache.spark.sql.catalyst.plans.logical.{LogicalPlan, Project,
SubqueryAlias}
+import org.apache.spark.sql.internal.{SessionState, SQLConf}
+import org.apache.spark.sql.parser.CarbonSpark2SqlParser
+import org.apache.spark.util.Utils
+
+import org.apache.carbondata.common.logging.LogServiceFactory
+
+/**
+ * Reflection APIs
+ */
+
+object CarbonClassReflectionUtils {
+
+ 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 = {
--- End diff --
Done
---
