Github user QiangCai commented on a diff in the pull request:

    https://github.com/apache/carbondata/pull/1317#discussion_r137916682
  
    --- Diff: 
integration/spark-common/src/main/scala/org/apache/carbondata/spark/rdd/PartitionDropper.scala
 ---
    @@ -0,0 +1,130 @@
    +/*
    + * 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.carbondata.spark.rdd
    +
    +import java.io.IOException
    +
    +import org.apache.spark.sql.execution.command.DropPartitionCallableModel
    +import org.apache.spark.util.PartitionUtils
    +
    +import org.apache.carbondata.common.logging.LogServiceFactory
    +import org.apache.carbondata.core.metadata.schema.partition.PartitionType
    +import org.apache.carbondata.spark.{AlterPartitionResultImpl, 
PartitionFactory}
    +
    +object PartitionDropper {
    +
    +  val logger = 
LogServiceFactory.getLogService(PartitionDropper.getClass.getName)
    +
    +  def triggerPartitionDrop(dropPartitionCallableModel: 
DropPartitionCallableModel): Unit = {
    +    val sc = dropPartitionCallableModel.sqlContext.sparkContext
    --- End diff --
    
    better to remove sc from DropPartitionCallableModel.
    suggest to package the parameters of AlterTableLoadPartitionRDD and 
CarbonScanPartitionRDD


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