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From gvramana <...@git.apache.org>
Subject [GitHub] incubator-carbondata pull request #641: [CARBONDATA-767] Alter table support...
Date Tue, 14 Mar 2017 13:33:44 GMT
Github user gvramana commented on a diff in the pull request:

    https://github.com/apache/incubator-carbondata/pull/641#discussion_r105867937
  
    --- Diff: core/src/main/java/org/apache/carbondata/core/scan/collector/impl/RestructureBasedRawResultCollector.java
---
    @@ -0,0 +1,265 @@
    +/*
    + * 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.core.scan.collector.impl;
    +
    +import java.nio.charset.Charset;
    +import java.util.ArrayList;
    +import java.util.List;
    +
    +import org.apache.carbondata.common.logging.LogService;
    +import org.apache.carbondata.common.logging.LogServiceFactory;
    +import org.apache.carbondata.core.cache.update.BlockletLevelDeleteDeltaDataCache;
    +import org.apache.carbondata.core.constants.CarbonCommonConstants;
    +import org.apache.carbondata.core.datastore.block.SegmentProperties;
    +import org.apache.carbondata.core.keygenerator.KeyGenException;
    +import org.apache.carbondata.core.keygenerator.KeyGenerator;
    +import org.apache.carbondata.core.keygenerator.mdkey.MultiDimKeyVarLengthGenerator;
    +import org.apache.carbondata.core.metadata.encoder.Encoding;
    +import org.apache.carbondata.core.metadata.schema.table.column.CarbonDimension;
    +import org.apache.carbondata.core.scan.executor.infos.BlockExecutionInfo;
    +import org.apache.carbondata.core.scan.model.QueryDimension;
    +import org.apache.carbondata.core.scan.model.QueryMeasure;
    +import org.apache.carbondata.core.scan.result.AbstractScannedResult;
    +import org.apache.carbondata.core.scan.wrappers.ByteArrayWrapper;
    +import org.apache.carbondata.core.util.CarbonUtil;
    +
    +import org.apache.commons.lang3.ArrayUtils;
    +import org.apache.spark.unsafe.types.UTF8String;
    +
    +/**
    + * It is not a collector it is just a scanned result holder.
    + */
    +public class RestructureBasedRawResultCollector extends AbstractScannedResultCollector
{
    +
    +  /**
    +   * logger
    +   */
    +  private static final LogService LOGGER =
    +      LogServiceFactory.getLogService(RestructureBasedRawResultCollector.class.getName());
    +
    +  /**
    +   * Key generator which will form the mdKey according to latest schema
    +   */
    +  private KeyGenerator restructuredKeyGenerator;
    +
    +  /**
    +   * Key generator for uncompressing current block values
    +   */
    +  private KeyGenerator updatedCurrentBlockKeyGenerator;
    +
    +  public RestructureBasedRawResultCollector(BlockExecutionInfo blockExecutionInfos) {
    +    super(blockExecutionInfos);
    +    initRestructuredKeyGenerator();
    +    initCurrentBlockKeyGenerator();
    +  }
    +
    +  /**
    +   * This method will create a new key generator for generating mdKey according to latest
schema
    +   */
    +  private void initRestructuredKeyGenerator() {
    +    SegmentProperties segmentProperties =
    +        tableBlockExecutionInfos.getDataBlock().getSegmentProperties();
    +    QueryDimension[] queryDimensions = tableBlockExecutionInfos.getActualQueryDimensions();
    +    List<Integer> updatedColumnCardinality = new ArrayList<>(queryDimensions.length);
    +    List<Integer> updatedDimensionPartitioner = new ArrayList<>(queryDimensions.length);
    +    int[] dictionaryColumnBlockIndex = tableBlockExecutionInfos.getDictionaryColumnBlockIndex();
    +    int dimCounterInCurrentBlock = 0;
    +    for (int i = 0; i < queryDimensions.length; i++) {
    +      if (queryDimensions[i].getDimension().hasEncoding(Encoding.DICTIONARY)) {
    +        if (tableBlockExecutionInfos.getDimensionInfo().getDimensionExists()[i]) {
    +          // get the dictionary key ordinal as column cardinality in segment properties
    +          // will only be for dictionary encoded columns
    +          CarbonDimension currentBlockDimension = segmentProperties.getDimensions()
    +              .get(dictionaryColumnBlockIndex[dimCounterInCurrentBlock]);
    +          updatedColumnCardinality.add(segmentProperties
    +              .getDimColumnsCardinality()[currentBlockDimension.getKeyOrdinal()]);
    +          updatedDimensionPartitioner.add(segmentProperties
    +              .getDimensionPartitions()[currentBlockDimension.getKeyOrdinal()]);
    +          dimCounterInCurrentBlock++;
    +        } else {
    +          // partitioner index will be 1 every column will be in columnar format
    +          updatedDimensionPartitioner.add(1);
    +          // for direct dictionary 4 bytes need to be allocated else 1
    +          if (queryDimensions[i].getDimension().hasEncoding(Encoding.DIRECT_DICTIONARY))
{
    +            updatedColumnCardinality.add(Integer.MAX_VALUE);
    +          } else {
    +            // cardinality will be 2 will user has provided a default value
    +            byte[] defaultValue = queryDimensions[i].getDimension().getDefaultValue();
    +            if (null != defaultValue) {
    +              updatedColumnCardinality
    +                  .add(CarbonCommonConstants.DICTIONARY_DEFAULT_CARDINALITY + 1);
    +            } else {
    +              updatedColumnCardinality.add(CarbonCommonConstants.DICTIONARY_DEFAULT_CARDINALITY);
    +            }
    +          }
    +        }
    +      }
    +    }
    +    if (!updatedColumnCardinality.isEmpty()) {
    +      int[] latestColumnCardinality = ArrayUtils.toPrimitive(
    +          updatedColumnCardinality.toArray(new Integer[updatedColumnCardinality.size()]));
    +      int[] latestColumnPartitioner = ArrayUtils.toPrimitive(
    +          updatedDimensionPartitioner.toArray(new Integer[updatedDimensionPartitioner.size()]));
    +      int[] dimensionBitLength =
    +          CarbonUtil.getDimensionBitLength(latestColumnCardinality, latestColumnPartitioner);
    +      restructuredKeyGenerator = new MultiDimKeyVarLengthGenerator(dimensionBitLength);
    +    }
    +  }
    +
    +  /**
    +   * This method will initialize the block key generator for the current block based
on the
    +   * dictionary columns present in the current block
    +   */
    +  private void initCurrentBlockKeyGenerator() {
    +    SegmentProperties segmentProperties =
    +        tableBlockExecutionInfos.getDataBlock().getSegmentProperties();
    +    int[] dictionaryColumnBlockIndex = tableBlockExecutionInfos.getDictionaryColumnBlockIndex();
    +    int[] updatedColumnCardinality = new int[dictionaryColumnBlockIndex.length];
    +    int[] updatedDimensionPartitioner = new int[dictionaryColumnBlockIndex.length];
    +    for (int i = 0; i < dictionaryColumnBlockIndex.length; i++) {
    +      // get the dictionary key ordinal as column cardinality in segment properties
    +      // will only be for dictionary encoded columns
    +      CarbonDimension currentBlockDimension = segmentProperties.getDimensions()
    +          .get(dictionaryColumnBlockIndex[i]);
    +      updatedColumnCardinality[i] =
    +          segmentProperties.getDimColumnsCardinality()[currentBlockDimension.getKeyOrdinal()];
    +      updatedDimensionPartitioner[i] =
    +          segmentProperties.getDimensionPartitions()[currentBlockDimension.getKeyOrdinal()];
    +    }
    +    if (dictionaryColumnBlockIndex.length > 0) {
    +      int[] dimensionBitLength =
    +          CarbonUtil.getDimensionBitLength(updatedColumnCardinality, updatedDimensionPartitioner);
    +      updatedCurrentBlockKeyGenerator = new MultiDimKeyVarLengthGenerator(dimensionBitLength);
    +    }
    +  }
    +
    +  /**
    +   * This method will add a record both key and value to list object
    +   * it will keep track of how many record is processed, to handle limit scenario
    +   */
    +  @Override public List<Object[]> collectData(AbstractScannedResult scannedResult,
int batchSize) {
    +    List<Object[]> listBasedResult = new ArrayList<>(batchSize);
    +    QueryMeasure[] queryMeasures = tableBlockExecutionInfos.getActualQueryMeasures();
    +    ByteArrayWrapper wrapper = null;
    +    BlockletLevelDeleteDeltaDataCache deleteDeltaDataCache =
    +        scannedResult.getDeleteDeltaDataCache();
    +    // scan the record and add to list
    +    int rowCounter = 0;
    +    while (scannedResult.hasNext() && rowCounter < batchSize) {
    +      byte[] dictionaryKeyArray = scannedResult.getDictionaryKeyArray();
    +      byte[][] noDictionaryKeyArray = scannedResult.getNoDictionaryKeyArray();
    +      byte[][] complexTypeKeyArray = scannedResult.getComplexTypeKeyArray();
    +      byte[] implicitColumnByteArray = scannedResult.getBlockletId()
    +          .getBytes(Charset.forName(CarbonCommonConstants.DEFAULT_CHARSET));
    +      if (null != deleteDeltaDataCache && deleteDeltaDataCache
    +          .contains(scannedResult.getCurrenrRowId())) {
    +        continue;
    +      }
    +      Object[] row = new Object[1 + queryMeasures.length];
    +      wrapper = new ByteArrayWrapper();
    +      wrapper.setDictionaryKey(fillDictionaryKeyArrayWithLatestSchema(dictionaryKeyArray));
    --- End diff --
    
    Call fillDictionaryKeyArrayWithLatestSchema, only if any change in corresponding byte[].
    Same with fillNoDictionaryKeyArrayWithLatestSchema


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