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From: lionelcao <git@git.apache.org>
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References: <git-pr-1105-carbondata@git.apache.org>
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Subject: [GitHub] carbondata pull request #1105: [WIP] Implement range interval partition
Content-Type: text/plain
Message-Id: <20170710030453.9C9A5E96B2@git1-us-west.apache.org>
Date: Mon, 10 Jul 2017 03:04:53 +0000 (UTC)
archived-at: Mon, 10 Jul 2017 03:05:35 -0000

Github user lionelcao commented on a diff in the pull request:

    https://github.com/apache/carbondata/pull/1105#discussion_r126328252
  
    --- Diff: core/src/main/java/org/apache/carbondata/core/scan/partition/RangeIntervalPartitioner.java ---
    @@ -0,0 +1,206 @@
    +/*
    + * 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.partition;
    +
    +import java.io.Serializable;
    +import java.text.SimpleDateFormat;
    +import java.util.ArrayList;
    +import java.util.Calendar;
    +import java.util.List;
    +
    +import org.apache.carbondata.core.constants.CarbonCommonConstants;
    +import org.apache.carbondata.core.metadata.datatype.DataType;
    +import org.apache.carbondata.core.metadata.schema.PartitionInfo;
    +import org.apache.carbondata.core.util.CarbonProperties;
    +
    +/**
    + * Range Interval Partitioner
    + */
    +
    +public class RangeIntervalPartitioner implements Partitioner {
    +
    +  private int numPartitions;
    +  private RangeIntervalComparator comparator;
    +  private List<Object> boundsList = new ArrayList<>();
    +  private String intervalType;
    +  private DataType partitionColumnDataType;
    +
    +  private SimpleDateFormat timestampFormatter = new SimpleDateFormat(CarbonProperties.getInstance()
    +      .getProperty(CarbonCommonConstants.CARBON_TIMESTAMP_FORMAT,
    +          CarbonCommonConstants.CARBON_TIMESTAMP_DEFAULT_FORMAT));
    +
    +  private SimpleDateFormat dateFormatter = new SimpleDateFormat(CarbonProperties.getInstance()
    +      .getProperty(CarbonCommonConstants.CARBON_DATE_FORMAT,
    +          CarbonCommonConstants.CARBON_DATE_DEFAULT_FORMAT));
    +
    +  public RangeIntervalPartitioner(PartitionInfo partitionInfo) {
    +    List<String> values = partitionInfo.getRangeIntervalInfo();
    +    partitionColumnDataType = partitionInfo.getColumnSchemaList().get(0).getDataType();
    +    numPartitions = values.size() - 1;
    +    // -1 is just for instead of null
    +    boundsList.add(-1L);
    +    for (int i = 0; i < numPartitions; i++) {
    +      boundsList.add(PartitionUtil.getDataBasedOnDataType(values.get(i), partitionColumnDataType,
    +          timestampFormatter, dateFormatter));
    +    }
    +    comparator = new RangeIntervalComparator();
    +    intervalType = values.get(numPartitions);
    +  }
    +
    +  @Override public int numPartitions() {
    +    String numParStr = CarbonProperties.getInstance().getProperty(
    +        CarbonCommonConstants.MAX_PARTITION_FOR_RANGE_INTERVAL,
    +        CarbonCommonConstants.DEFAULT_MAX_PARTITION_FOR_RANGE_INTERVAL);
    +    return Integer.parseInt(numParStr);
    +  }
    +
    +  @Override public int getPartition(Object key) {
    +    int partitionIndex = -1;
    +    Object lastBound = boundsList.get(boundsList.size() - 1);
    +    if (key == null) {
    +      return 0;
    +    } else {
    +      for (int i = 1; i <= numPartitions; i++) {
    +        if (comparator.compareTo(key, boundsList.get(i))) {
    +          return i;
    +        }
    +      }
    +      switch (intervalType.toLowerCase()) {
    +        case "year":
    +          partitionIndex = getDynamicPartitionForYear(key, lastBound);
    +          break;
    +        case "month":
    +          partitionIndex = getDynamicPartitionForMonth(key, lastBound);
    +          break;
    +        case "week":
    +          partitionIndex = getDynamicPartitionForWeek(key, lastBound);
    +          break;
    +        case "day":
    +          partitionIndex = getDynamicPartitionForDay(key, lastBound);
    +          break;
    +        case "hour":
    +          partitionIndex = getDynamicPartitionForHour(key, lastBound);
    +          break;
    +        default:
    +          partitionIndex = -1;
    +      }
    +      // if value's partitionId is great than max partition, return 0 for it.
    +      if (partitionIndex >= numPartitions()) {
    +        return 0;
    +      }
    +      return partitionIndex;
    +    }
    +  }
    +
    +  public int getDynamicPartitionForYear(Object key, Object lastBound) {
    +    int partitionId = -1;
    +    Calendar lastCalendar = Calendar.getInstance();
    +    Calendar keyCal = Calendar.getInstance();
    +    keyCal.setTimeInMillis((long)key);
    +    lastCalendar.setTimeInMillis((long)lastBound);
    +    while (true) {
    +      lastCalendar.add(Calendar.YEAR, 1);
    +      boundsList.add(boundsList.size(), lastCalendar.getTimeInMillis());
    +      ++numPartitions;
    +      if (keyCal.compareTo(lastCalendar) == -1) {
    +        partitionId = numPartitions;
    +        break;
    +      }
    +    }
    +    return partitionId;
    +  }
    +
    +  public int getDynamicPartitionForMonth(Object key, Object lastBound) {
    +    int partitionId = -1;
    +    Calendar lastCalendar = Calendar.getInstance();
    +    Calendar keyCal = Calendar.getInstance();
    +    keyCal.setTimeInMillis((long)key);
    +    lastCalendar.setTimeInMillis((long)lastBound);
    +    while (true) {
    +      lastCalendar.add(Calendar.MONTH, 1);
    +      boundsList.add(boundsList.size(), lastCalendar.getTimeInMillis());
    +      ++numPartitions;
    +      if (keyCal.compareTo(lastCalendar) == -1) {
    +        partitionId = numPartitions;
    +        break;
    +      }
    +    }
    +    return partitionId;
    --- End diff --
    
    this should be partition index


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