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From tejasapatil <...@git.apache.org>
Subject [GitHub] spark pull request #13775: [SPARK-16060][SQL] Vectorized Orc reader
Date Tue, 18 Oct 2016 00:55:46 GMT
Github user tejasapatil commented on a diff in the pull request:

    https://github.com/apache/spark/pull/13775#discussion_r83756710
  
    --- Diff: sql/hive/src/main/java/org/apache/hadoop/hive/ql/io/orc/SparkVectorizedOrcRecordReader.java
---
    @@ -0,0 +1,189 @@
    +/*
    + * 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.hadoop.hive.ql.io.orc;
    +
    +import java.io.IOException;
    +import java.util.LinkedList;
    +import java.util.List;
    +
    +import org.apache.hadoop.conf.Configuration;
    +import org.apache.hadoop.hive.ql.exec.vector.ColumnVector;
    +import org.apache.hadoop.hive.ql.exec.vector.BytesColumnVector;
    +import org.apache.hadoop.hive.ql.exec.vector.DecimalColumnVector;
    +import org.apache.hadoop.hive.ql.exec.vector.DoubleColumnVector;
    +import org.apache.hadoop.hive.ql.exec.vector.LongColumnVector;
    +import org.apache.hadoop.hive.ql.exec.vector.VectorizedRowBatch;
    +import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
    +import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorFactory;
    +import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector;
    +import org.apache.hadoop.hive.serde2.objectinspector.StructField;
    +import org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector;
    +import org.apache.hadoop.hive.serde2.typeinfo.DecimalTypeInfo;
    +import org.apache.hadoop.hive.serde2.typeinfo.PrimitiveTypeInfo;
    +import org.apache.hadoop.io.NullWritable;
    +import org.apache.hadoop.mapred.FileSplit;
    +import org.apache.hadoop.mapred.RecordReader;
    +
    +/**
    + * A mapred.RecordReader that returns VectorizedRowBatch.
    + */
    +public class SparkVectorizedOrcRecordReader
    +      implements RecordReader<NullWritable, VectorizedRowBatch> {
    +    private final org.apache.hadoop.hive.ql.io.orc.RecordReader reader;
    +    private final long offset;
    +    private final long length;
    +    private float progress = 0.0f;
    +    private ObjectInspector objectInspector;
    +
    +    SparkVectorizedOrcRecordReader(Reader file, Configuration conf,
    +        FileSplit fileSplit) throws IOException {
    +      this.offset = fileSplit.getStart();
    +      this.length = fileSplit.getLength();
    +      this.objectInspector = file.getObjectInspector();
    +      this.reader = OrcInputFormat.createReaderFromFile(file, conf, this.offset,
    +        this.length);
    +      this.progress = reader.getProgress();
    +    }
    +
    +    /**
    +     * Create a ColumnVector based on given ObjectInspector's type info.
    +     *
    +     * @param inspector ObjectInspector
    +     */
    +    private ColumnVector createColumnVector(ObjectInspector inspector) {
    +      switch(inspector.getCategory()) {
    +        case PRIMITIVE:
    +          {
    +            PrimitiveTypeInfo primitiveTypeInfo =
    +              (PrimitiveTypeInfo) ((PrimitiveObjectInspector)inspector).getTypeInfo();
    +            switch(primitiveTypeInfo.getPrimitiveCategory()) {
    +              case BOOLEAN:
    +              case BYTE:
    +              case SHORT:
    +              case INT:
    +              case LONG:
    +              case DATE:
    +              case INTERVAL_YEAR_MONTH:
    +                return new LongColumnVector(VectorizedRowBatch.DEFAULT_SIZE);
    +              case FLOAT:
    +              case DOUBLE:
    +                return new DoubleColumnVector(VectorizedRowBatch.DEFAULT_SIZE);
    +              case BINARY:
    +              case STRING:
    +              case CHAR:
    +              case VARCHAR:
    +                BytesColumnVector column = new BytesColumnVector(VectorizedRowBatch.DEFAULT_SIZE);
    +                column.initBuffer();
    +                return column;
    +              case DECIMAL:
    +                DecimalTypeInfo tInfo = (DecimalTypeInfo) primitiveTypeInfo;
    +                return new DecimalColumnVector(VectorizedRowBatch.DEFAULT_SIZE,
    +                    tInfo.precision(), tInfo.scale());
    +              default:
    +                throw new RuntimeException("Vectorizaton is not supported for datatype:"
    +                    + primitiveTypeInfo.getPrimitiveCategory());
    +            }
    +          }
    +        default:
    +          throw new RuntimeException("Vectorization is not supported for datatype:"
    +              + inspector.getCategory());
    +      }
    +    }
    +
    +    /**
    +     * Walk through the object inspector and add column vectors
    +     *
    +     * @param oi StructObjectInspector
    +     * @param cvList ColumnVectors are populated in this list
    +     */
    +    private void allocateColumnVector(StructObjectInspector oi,
    +        List<ColumnVector> cvList) {
    +      if (cvList == null) {
    +        throw new RuntimeException("Null columnvector list");
    +      }
    +      if (oi == null) {
    +        return;
    +      }
    +      final List<? extends StructField> fields = oi.getAllStructFieldRefs();
    +      for(StructField field : fields) {
    +        ObjectInspector fieldObjectInspector = field.getFieldObjectInspector();
    +        cvList.add(createColumnVector(fieldObjectInspector));
    +      }
    +    }
    +
    +    /**
    +     * Create VectorizedRowBatch from ObjectInspector
    +     *
    +     * @param oi StructObjectInspector
    +     * @return VectorizedRowBatch
    +     */
    +    private VectorizedRowBatch constructVectorizedRowBatch(
    +        StructObjectInspector oi) {
    +      final List<ColumnVector> cvList = new LinkedList<ColumnVector>();
    +      allocateColumnVector(oi, cvList);
    +      final VectorizedRowBatch result = new VectorizedRowBatch(cvList.size());
    +      int i = 0;
    +      for(ColumnVector cv : cvList) {
    +        result.cols[i++] = cv;
    +      }
    +      return result;
    +    }
    +
    +    @Override
    +    public boolean next(NullWritable key, VectorizedRowBatch value) throws IOException
{
    +      if (reader.hasNext()) {
    +        try {
    +          reader.nextBatch(value);
    +          if (value == null || value.endOfFile || value.size == 0) {
    +            return false;
    +          }
    +        } catch (Exception e) {
    +          throw new RuntimeException(e);
    +        }
    +        progress = reader.getProgress();
    +        return true;
    +      } else {
    +        return false;
    +      }
    +    }
    +
    +    @Override
    +    public NullWritable createKey() {
    +      return NullWritable.get();
    +    }
    +
    +    @Override
    +    public VectorizedRowBatch createValue() {
    +      return constructVectorizedRowBatch((StructObjectInspector)this.objectInspector);
    --- End diff --
    
    nit: space after `(StructObjectInspector)`


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