Github user ajantha-bhat commented on a diff in the pull request: https://github.com/apache/carbondata/pull/2869#discussion_r229254647 --- Diff: hadoop/src/main/java/org/apache/carbondata/hadoop/util/CarbonVectorizedRecordReader.java --- @@ -0,0 +1,194 @@ +/* + * 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.hadoop.util; + +import java.io.IOException; +import java.util.ArrayList; +import java.util.List; + +import org.apache.carbondata.common.logging.LogServiceFactory; +import org.apache.carbondata.core.constants.CarbonV3DataFormatConstants; +import org.apache.carbondata.core.datastore.block.TableBlockInfo; +import org.apache.carbondata.core.metadata.datatype.DataType; +import org.apache.carbondata.core.metadata.datatype.DataTypes; +import org.apache.carbondata.core.metadata.datatype.DecimalType; +import org.apache.carbondata.core.metadata.datatype.StructField; +import org.apache.carbondata.core.scan.executor.QueryExecutor; +import org.apache.carbondata.core.scan.executor.QueryExecutorFactory; +import org.apache.carbondata.core.scan.executor.exception.QueryExecutionException; +import org.apache.carbondata.core.scan.model.ProjectionDimension; +import org.apache.carbondata.core.scan.model.ProjectionMeasure; +import org.apache.carbondata.core.scan.model.QueryModel; +import org.apache.carbondata.core.scan.result.iterator.AbstractDetailQueryResultIterator; +import org.apache.carbondata.core.scan.result.vector.CarbonColumnVector; +import org.apache.carbondata.core.scan.result.vector.CarbonColumnarBatch; +import org.apache.carbondata.core.scan.result.vector.impl.CarbonColumnVectorImpl; +import org.apache.carbondata.core.util.ByteUtil; +import org.apache.carbondata.hadoop.AbstractRecordReader; +import org.apache.carbondata.hadoop.CarbonInputSplit; + +import org.apache.hadoop.mapreduce.InputSplit; +import org.apache.hadoop.mapreduce.TaskAttemptContext; +import org.apache.log4j.Logger; + +/** + * A specialized RecordReader that reads into CarbonColumnarBatches directly using the + * carbondata column APIs and fills the data directly into columns. + */ +public class CarbonVectorizedRecordReader extends AbstractRecordReader<Object> { + + private static final Logger LOGGER = + LogServiceFactory.getLogService(CarbonVectorizedRecordReader.class.getName()); + + private CarbonColumnarBatch carbonColumnarBatch; + + private QueryExecutor queryExecutor; + + private int batchIdx = 0; + + private int numBatched = 0; + + private AbstractDetailQueryResultIterator iterator; + + private QueryModel queryModel; + + public CarbonVectorizedRecordReader(QueryModel queryModel) { + this.queryModel = queryModel; + } + + @Override public void initialize(InputSplit inputSplit, TaskAttemptContext taskAttemptContext) + throws IOException, InterruptedException { + List<CarbonInputSplit> splitList; + if (inputSplit instanceof CarbonInputSplit) { + splitList = new ArrayList<>(1); + splitList.add((CarbonInputSplit) inputSplit); + } else { + throw new RuntimeException("unsupported input split type: " + inputSplit); + } + List<TableBlockInfo> tableBlockInfoList = CarbonInputSplit.createBlocks(splitList); + queryModel.setTableBlockInfos(tableBlockInfoList); + queryModel.setVectorReader(true); + try { + queryExecutor = + QueryExecutorFactory.getQueryExecutor(queryModel, taskAttemptContext.getConfiguration()); + iterator = (AbstractDetailQueryResultIterator) queryExecutor.execute(queryModel); + } catch (QueryExecutionException e) { + LOGGER.error(e); + throw new InterruptedException(e.getMessage()); + } catch (Exception e) { + LOGGER.error(e); + throw e; + } + } + + @Override public boolean nextKeyValue() throws IOException, InterruptedException { + initBatch(); --- End diff -- move initBatch() to initialize method
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