integration/spark/src/main/java/org/apache/carbondata/spark/readsupport/SparkRowReadSupportImpl.java

/*
 * 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.readsupport;

import java.io.IOException;
import java.sql.Date;
import java.sql.Timestamp;

import org.apache.carbondata.core.metadata.AbsoluteTableIdentifier;
import org.apache.carbondata.core.metadata.datatype.DataTypes;
import org.apache.carbondata.core.metadata.encoder.Encoding;
import org.apache.carbondata.core.metadata.schema.table.column.CarbonColumn;
import org.apache.carbondata.core.metadata.schema.table.column.CarbonDimension;
import org.apache.carbondata.core.util.DataTypeUtil;
import org.apache.carbondata.hadoop.readsupport.impl.DictionaryDecodeReadSupport;

import org.apache.spark.sql.Row;
import org.apache.spark.sql.catalyst.expressions.GenericRow;
import org.apache.spark.unsafe.types.UTF8String;

public class SparkRowReadSupportImpl extends DictionaryDecodeReadSupport<Row> {

  @Override public void initialize(CarbonColumn[] carbonColumns,
      AbsoluteTableIdentifier absoluteTableIdentifier) throws IOException {
    super.initialize(carbonColumns, absoluteTableIdentifier);
    //can initialize and generate schema here.
  }

  @Override public Row readRow(Object[] data) {
    for (int i = 0; i < dictionaries.length; i++) {
      if (data[i] == null) {
        continue;
      }
      if (dictionaries[i] != null) {
        data[i] = DataTypeUtil
            .getDataBasedOnDataType(dictionaries[i].getDictionaryValueForKeyInBytes((int) data[i]),
                (CarbonDimension) carbonColumns[i]);
        if (data[i] == null) {
          continue;
        }
        if (dataTypes[i] == DataTypes.STRING) {
          data[i] = UTF8String.fromString(data[i].toString());
        } else if (dataTypes[i] == DataTypes.TIMESTAMP) {
          data[i] = new Timestamp((long) data[i]);
        } else if (dataTypes[i] == DataTypes.DATE) {
          data[i] = new Date((long) data[i]);
        } else if (dataTypes[i] == DataTypes.LONG) {
          data[i] = data[i];
        }
      }
      else if (carbonColumns[i].hasEncoding(Encoding.DIRECT_DICTIONARY)) {
        //convert the long to timestamp in case of direct dictionary column
        if (DataTypes.TIMESTAMP == carbonColumns[i].getDataType()) {
          data[i] = new Timestamp((long) data[i] / 1000L);
        } else if (DataTypes.DATE == carbonColumns[i].getDataType()) {
          data[i] = new Date((long) data[i]);
        }
      }
    }
    return new GenericRow(data);
  }
}