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.hive;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.carbondata.core.datastore.block.TableBlockInfo;
  import org.apache.carbondata.core.scan.model.QueryModel;
  import org.apache.carbondata.core.scan.result.iterator.ChunkRowIterator;
  import org.apache.carbondata.hadoop.CarbonRecordReader;
  import org.apache.carbondata.hadoop.readsupport.CarbonReadSupport;
  
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.hive.serde.serdeConstants;
  import org.apache.hadoop.hive.serde2.typeinfo.TypeInfo;
  import org.apache.hadoop.hive.serde2.typeinfo.TypeInfoUtils;
  import org.apache.hadoop.io.ArrayWritable;
  import org.apache.hadoop.io.Writable;
  import org.apache.hadoop.mapred.InputSplit;
  import org.apache.hadoop.mapred.JobConf;
  
  class CarbonHiveRecordReader extends CarbonRecordReader<ArrayWritable>
      implements org.apache.hadoop.mapred.RecordReader<Void, ArrayWritable> {
  
    private ArrayWritable valueObj = null;
    private long recordReaderCounter = 0;
    private int[] columnIds;
  
    public CarbonHiveRecordReader(QueryModel queryModel, CarbonReadSupport<ArrayWritable> readSupport,
        InputSplit inputSplit, JobConf jobConf) throws IOException {
      super(queryModel, readSupport, jobConf);
      initialize(inputSplit, jobConf);
    }
  
    private void initialize(InputSplit inputSplit, Configuration conf) throws IOException {
      // The input split can contain single HDFS block or multiple blocks, so firstly get all the
      // blocks and then set them in the query model.
      List<CarbonHiveInputSplit> splitList;
      if (inputSplit instanceof CarbonHiveInputSplit) {
        splitList = new ArrayList<>(1);
        splitList.add((CarbonHiveInputSplit) inputSplit);
      } else {
        throw new RuntimeException("unsupported input split type: " + inputSplit);
      }
      List<TableBlockInfo> tableBlockInfoList = CarbonHiveInputSplit.createBlocks(splitList);
      queryModel.setTableBlockInfos(tableBlockInfoList);
      readSupport.initialize(queryModel.getProjectionColumns(), queryModel.getTable());
      carbonIterator = new ChunkRowIterator(queryExecutor.execute(queryModel));
      final TypeInfo rowTypeInfo;
      final List<String> columnNames;
      List<TypeInfo> columnTypes;
      // Get column names and sort order
      final String colIds = conf.get("hive.io.file.readcolumn.ids");
      final String columnTypeProperty = conf.get(serdeConstants.LIST_COLUMN_TYPES);
  
      if (columnTypeProperty.length() == 0) {
        columnTypes = new ArrayList<TypeInfo>();
      } else {
        columnTypes = TypeInfoUtils.getTypeInfosFromTypeString(columnTypeProperty);
      }
  
      if (valueObj == null) {
        valueObj = new ArrayWritable(Writable.class, new Writable[columnTypes.size()]);
      }
  
      if (null != colIds && !colIds.equals("")) {
        String[] arraySelectedColId = colIds.split(",");
        columnIds = new int[arraySelectedColId.length];
        for (int j = 0; j < arraySelectedColId.length; j++) {
          columnIds[j] = Integer.parseInt(arraySelectedColId[j]);
        }
      }
    }
  
    @Override
    public boolean next(Void aVoid, ArrayWritable value) {
      if (carbonIterator.hasNext()) {
        Object obj = readSupport.readRow(carbonIterator.next());
        recordReaderCounter++;
        Writable[] objArray = (Writable[]) obj;
        Writable[] sysArray = new Writable[value.get().length];
        if (columnIds != null && columnIds.length > 0 && objArray.length == columnIds.length) {
          for (int i = 0; i < columnIds.length; i++) {
            sysArray[columnIds[i]] = objArray[i];
          }
          value.set(sysArray);
        } else {
          value.set(objArray);
        }
        return true;
      } else {
        try {
          queryExecutor.finish();
        } catch (Exception e) {
          throw new RuntimeException(e);
        }
        return false;
      }
    }
  
    @Override
    public QueryModel getQueryModel() {
      return queryModel;
    }
  
    @Override
    public Void createKey() {
      return null;
    }
  
    @Override
    public ArrayWritable createValue() {
      return valueObj;
    }
  
    @Override
    public long getPos() {
      return recordReaderCounter;
    }
  
    @Override
    public float getProgress() {
      return 0;
    }
  
  }