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From chenliang613 <...@git.apache.org>
Subject [GitHub] carbondata pull request #1142: [CARBONDATA-1271] Enhanced Performance for Hi...
Date Fri, 07 Jul 2017 05:10:39 GMT
Github user chenliang613 commented on a diff in the pull request:

    https://github.com/apache/carbondata/pull/1142#discussion_r126070269
  
    --- Diff: integration/hive/src/main/java/org/apache/carbondata/hive/DictionaryDecodeReadSupport.java
---
    @@ -0,0 +1,288 @@
    +/*
    + * 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.sql.Date;
    +import java.sql.Timestamp;
    +import java.util.ArrayList;
    +import java.util.List;
    +
    +import org.apache.carbondata.core.cache.Cache;
    +import org.apache.carbondata.core.cache.CacheProvider;
    +import org.apache.carbondata.core.cache.CacheType;
    +import org.apache.carbondata.core.cache.dictionary.Dictionary;
    +import org.apache.carbondata.core.cache.dictionary.DictionaryColumnUniqueIdentifier;
    +import org.apache.carbondata.core.metadata.AbsoluteTableIdentifier;
    +import org.apache.carbondata.core.metadata.datatype.DataType;
    +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.CarbonUtil;
    +import org.apache.carbondata.hadoop.readsupport.CarbonReadSupport;
    +
    +import org.apache.hadoop.hive.common.type.HiveDecimal;
    +import org.apache.hadoop.hive.serde2.io.DateWritable;
    +import org.apache.hadoop.hive.serde2.io.DoubleWritable;
    +import org.apache.hadoop.hive.serde2.io.HiveDecimalWritable;
    +import org.apache.hadoop.hive.serde2.io.ShortWritable;
    +import org.apache.hadoop.hive.serde2.io.TimestampWritable;
    +
    +import org.apache.hadoop.io.ArrayWritable;
    +import org.apache.hadoop.io.IntWritable;
    +import org.apache.hadoop.io.LongWritable;
    +import org.apache.hadoop.io.Text;
    +import org.apache.hadoop.io.Writable;
    +
    +import org.apache.spark.sql.catalyst.expressions.GenericInternalRow;
    +import org.apache.spark.sql.catalyst.util.GenericArrayData;
    +
    +/**
    + *  This is the class to decode dictionary encoded column data back to its original value.
    + */
    +public class DictionaryDecodeReadSupport<T> implements CarbonReadSupport<T>
{
    +
    +  protected Dictionary[] dictionaries;
    +
    +  protected DataType[] dataTypes;
    +  /**
    +   * carbon columns
    +   */
    +  protected CarbonColumn[] carbonColumns;
    +
    +  protected Writable[] writableArr;
    +
    +  /**
    +   * This initialization is done inside executor task
    +   * for column dictionary involved in decoding.
    +   *
    +   * @param carbonColumns           column list
    +   * @param absoluteTableIdentifier table identifier
    +   */
    +  @Override public void initialize(CarbonColumn[] carbonColumns,
    +      AbsoluteTableIdentifier absoluteTableIdentifier) throws IOException {
    +    this.carbonColumns = carbonColumns;
    +    dictionaries = new Dictionary[carbonColumns.length];
    +    dataTypes = new DataType[carbonColumns.length];
    +    for (int i = 0; i < carbonColumns.length; i++) {
    +      if (carbonColumns[i].hasEncoding(Encoding.DICTIONARY) && !carbonColumns[i]
    +          .hasEncoding(Encoding.DIRECT_DICTIONARY) && !carbonColumns[i].isComplex())
{
    +        CacheProvider cacheProvider = CacheProvider.getInstance();
    +        Cache<DictionaryColumnUniqueIdentifier, Dictionary> forwardDictionaryCache
= cacheProvider
    +            .createCache(CacheType.FORWARD_DICTIONARY, absoluteTableIdentifier.getStorePath());
    +        dataTypes[i] = carbonColumns[i].getDataType();
    +        dictionaries[i] = forwardDictionaryCache.get(
    +            new DictionaryColumnUniqueIdentifier(absoluteTableIdentifier.getCarbonTableIdentifier(),
    +                carbonColumns[i].getColumnIdentifier(), dataTypes[i]));
    +      } else {
    +        dataTypes[i] = carbonColumns[i].getDataType();
    +      }
    +    }
    +  }
    +
    +  @Override public T readRow(Object[] data) {
    +    assert (data.length == dictionaries.length);
    +    writableArr = new Writable[data.length];
    +    for (int i = 0; i < dictionaries.length; i++) {
    +      if (dictionaries[i] != null) {
    +        data[i] = dictionaries[i].getDictionaryValueForKey((int) data[i]);
    +      }
    +      try {
    +        writableArr[i] = createWritableObject(data[i], carbonColumns[i]);
    +      } catch (IOException e) {
    +        throw new RuntimeException(e.getMessage(), e);
    +      }
    +    }
    +
    +    return (T) writableArr;
    +  }
    +
    +  /**
    +   * to book keep the dictionary cache or update access count for each
    +   * column involved during decode, to facilitate LRU cache policy if memory
    +   * threshold is reached
    +   */
    +  @Override public void close() {
    +    if (dictionaries == null) {
    +      return;
    +    }
    +    for (int i = 0; i < dictionaries.length; i++) {
    +      CarbonUtil.clearDictionaryCache(dictionaries[i]);
    +    }
    +  }
    +
    +  /**
    +   * To Create the Writable from the CarbonData data
    +   *
    +   * @param obj
    +   * @param carbonColumn
    +   * @return
    +   * @throws IOException
    +   */
    +  private Writable createWritableObject(Object obj, CarbonColumn carbonColumn) throws
IOException {
    +    DataType dataType = carbonColumn.getDataType();
    +    switch (dataType) {
    +      case STRUCT:
    +        return createStruct(obj, carbonColumn);
    +      case ARRAY:
    +        return createArray(obj, carbonColumn);
    +      default:
    +        return createWritablePrimitive(obj, carbonColumn);
    +    }
    +  }
    +
    +  /**
    +   * Create Array Data for Array Datatype
    +   *
    +   * @param obj
    +   * @param carbonColumn
    +   * @return
    +   * @throws IOException
    +   */
    +  private ArrayWritable createArray(Object obj, CarbonColumn carbonColumn) throws IOException
{
    +    if (obj instanceof GenericArrayData) {
    +
    +      Object[] objArray = ((GenericArrayData) obj).array();
    +      List<CarbonDimension> childCarbonDimensions = null;
    +      CarbonDimension arrayDimension = null;
    +      if (carbonColumn.isDimension() && carbonColumn.getColumnSchema().getNumberOfChild()
> 0) {
    +        childCarbonDimensions = ((CarbonDimension) carbonColumn).getListOfChildDimensions();
    +        arrayDimension = childCarbonDimensions.get(0);
    +      }
    +      List array = new ArrayList();
    +      if (objArray != null) {
    +        for (int i = 0; i < objArray.length; i++) {
    +          Object curObj = objArray[i];
    +          Writable newObj = createWritableObject(curObj, arrayDimension);
    +          array.add(newObj);
    +        }
    +      }
    +      if (array.size() > 0) {
    +        ArrayWritable subArray = new ArrayWritable(Writable.class,
    +            (Writable[]) array.toArray(new Writable[array.size()]));
    +        return new ArrayWritable(Writable.class, new Writable[] { subArray });
    +      }
    +    }
    +    return null;
    +  }
    +
    +  /**
    +   * Create the Struct data for the Struct Datatype
    +   *
    +   * @param obj
    +   * @param carbonColumn
    +   * @return
    +   * @throws IOException
    +   */
    +  private ArrayWritable createStruct(Object obj, CarbonColumn carbonColumn) throws IOException
{
    +    if (obj instanceof GenericInternalRow) {
    +      Object[] objArray = ((GenericInternalRow) obj).values();
    +      List<CarbonDimension> childCarbonDimensions = null;
    +      if (carbonColumn.isDimension() && carbonColumn.getColumnSchema().getNumberOfChild()
> 0) {
    +        childCarbonDimensions = ((CarbonDimension) carbonColumn).getListOfChildDimensions();
    +      }
    +      Writable[] arr = new Writable[objArray.length];
    +      for (int i = 0; i < objArray.length; i++) {
    +
    +        arr[i] = createWritableObject(objArray[i], childCarbonDimensions.get(i));
    +      }
    +      return new ArrayWritable(Writable.class, arr);
    +    }
    +    throw new IOException("DataType not supported in Carbondata");
    +  }
    +
    +  /**
    +   * This method will create the Writable Objects for primitives.
    +   *
    +   * @param obj
    +   * @param carbonColumn
    +   * @return
    +   * @throws IOException
    +   */
    +  private Writable createWritablePrimitive(Object obj, CarbonColumn carbonColumn)
    +      throws IOException {
    +    DataType dataType = carbonColumn.getDataType();
    +    if (obj == null) {
    +      return null;
    +    }
    +    switch (dataType) {
    +      case NULL:
    +        return null;
    +      case DOUBLE:
    +        return new DoubleWritable((double) obj);
    +      case INT:
    +        return new IntWritable((int) obj);
    +      case LONG:
    +        return new LongWritable((long) obj);
    +      case SHORT:
    +        return new ShortWritable((Short) obj);
    +      case DATE:
    +        return new DateWritable(new Date((Integer) obj));
    +      case TIMESTAMP:
    +        return new TimestampWritable(new Timestamp((long) obj));
    +      case STRING:
    +        return new Text(obj.toString());
    +      case DECIMAL:
    +        return new HiveDecimalWritable(
    +            HiveDecimal.create(((org.apache.spark.sql.types.Decimal) obj).toJavaBigDecimal()));
    +    }
    +    throw new IOException("Unknown primitive : " + dataType.getName());
    +  }
    +
    +  /**
    +   * If we need to use the same Writable[] then we can use this method
    +   *
    +   * @param writable
    +   * @param obj
    +   * @param carbonColumn
    +   * @throws IOException
    +   */
    +  private void setPrimitive(Writable writable, Object obj, CarbonColumn carbonColumn)
    +      throws IOException {
    +    DataType dataType = carbonColumn.getDataType();
    +    if (obj == null) {
    +      writable.write(null);
    +    }
    +    switch (dataType) {
    +      case DOUBLE:
    +        ((DoubleWritable) writable).set((double) obj);
    +        break;
    +      case INT:
    +        ((IntWritable) writable).set((int) obj);
    +        break;
    +      case LONG:
    +        ((LongWritable) writable).set((long) obj);
    +        break;
    +      case SHORT:
    +        ((ShortWritable) writable).set((short) obj);
    +        break;
    +      case DATE:
    +        ((DateWritable) writable).set(new Date((Long) obj));
    +        break;
    +      case TIMESTAMP:
    +        ((TimestampWritable) writable).set(new Timestamp((long) obj));
    +        break;
    +      case STRING:
    +        ((Text) writable).set(obj.toString());
    +        break;
    +      case DECIMAL:
    +        ((HiveDecimalWritable) writable)
    --- End diff --
    
    Please don't use spark's decimal, you can refer to pr 1110


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