integration/spark/src/main/scala/org/apache/spark/sql/hive/CarbonMVRules.scala

/*
 * 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.hive

import org.apache.spark.sql.SparkSession
import org.apache.spark.sql.catalyst.plans.logical.{Command, LogicalPlan}
import org.apache.spark.sql.catalyst.rules.Rule
import org.apache.spark.util.CarbonReflectionUtils

case class CarbonMVRules(sparkSession: SparkSession) extends Rule[LogicalPlan] {

  val mvPlan = try {
    CarbonReflectionUtils.createObject(
      "org.apache.carbondata.mv.extension.MVAnalyzerRule",
      sparkSession)._1.asInstanceOf[Rule[LogicalPlan]]
  } catch {
    case e: Exception =>
      null
  }

  override def apply(plan: LogicalPlan): LogicalPlan = {
    plan match {
      case _: Command => plan
      case _ =>
        if (mvPlan != null) {
          mvPlan.apply(plan)
        } else {
          plan
        }
    }
  }
}