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From sounakr <...@git.apache.org>
Subject [GitHub] carbondata pull request #1469: [CARBONDATA-1552][Spark-2.2 Integration] Spar...
Date Mon, 27 Nov 2017 06:02:37 GMT
Github user sounakr commented on a diff in the pull request:

    https://github.com/apache/carbondata/pull/1469#discussion_r153112035
  
    --- Diff: integration/spark-common/src/main/scala/org/apache/spark/util/CarbonReflectionUtils.scala
---
    @@ -0,0 +1,86 @@
    +/*
    + * 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 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
    --- End diff --
    
    Done


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