content: /*
   * 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.core.scan.executor;
  
  import java.io.IOException;
  
  import org.apache.carbondata.common.CarbonIterator;
  import org.apache.carbondata.core.scan.executor.exception.QueryExecutionException;
  import org.apache.carbondata.core.scan.model.QueryModel;
  
  /**
   * Interface for carbon query executor.
   * Will be used to execute the query based on the query model
   * and will return the iterator over query result
   */
  public interface QueryExecutor<E> {
  
    /**
     * Below method will be used to execute the query based on query model passed from driver
     *
     * @param queryModel query details
     * @return query result iterator
     * @throws IOException if fail to read files
     */
    CarbonIterator<E> execute(QueryModel queryModel) throws IOException;
  
    /**
     * Below method will be used for cleanup
     *
     * @throws QueryExecutionException
     */
    void finish() throws QueryExecutionException;
  }
  