[GitHub] carbondata pull request #842: [CARBONDATA-937] Data loading for partition ta...

[qiuchenjian-2]

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

    https://github.com/apache/carbondata/pull/842#discussion_r116005424
 
    --- Diff: core/src/main/java/org/apache/carbondata/core/scan/partition/RangePartitioner.java ---
    @@ -0,0 +1,132 @@
    +/*
    + * 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.math.BigDecimal;
    +import java.util.List;
    +
    +import org.apache.carbondata.core.metadata.datatype.DataType;
    +import org.apache.carbondata.core.metadata.schema.PartitionInfo;
    +import org.apache.carbondata.core.util.ByteUtil;
    +
    +/**
    + * Range Partitioner
    + */
    +public class RangePartitioner implements Partitioner {
    +
    +  private int partitions;
    +  private Object[] bounds;
    +  private Comparator comparator;
    +
    +  public RangePartitioner(PartitionInfo partitionInfo) {
    +    List<String> values = partitionInfo.getRangeInfo();
    +    DataType partitionColumnDataType = partitionInfo.getColumnSchemaList().get(0).getDataType();
    +    partitions = values.size();
    +    bounds = new Object[partitions];
    +    if (partitionColumnDataType == DataType.STRING) {
    +      for (int i = 0; i < partitions; i++) {
    +        bounds[i] = ByteUtil.toBytes(values.get(i));
    +      }
    +    } else {
    +      for (int i = 0; i < partitions; i++) {
    +        bounds[i] = PartitionUtil.getDataBasedOnDataType(values.get(i), partitionColumnDataType);
    +      }
    +    }
    +
    +    switch (partitionColumnDataType) {
    +      case INT:
    +        comparator = new IntComparator();
    +        break;
    +      case SHORT:
    +        comparator = new ShortComparator();
    +        break;
    +      case DOUBLE:
    +        comparator = new DoubleComparator();
    +        break;
    +      case LONG:
    +      case DATE:
    +      case TIMESTAMP:
    +        comparator = new LongComparator();
    +        break;
    +      case DECIMAL:
    +        comparator = new BigDecimalComparator();
    +        break;
    +      default:
    +        comparator = new ByteArrayComparator();
    +    }
    +  }
    +
    +  @Override public int numPartitions() {
    +    return partitions + 1;
    +  }
    +
    +  @Override public int getPartition(Object key) {
    +    if (key == null) {
    +      return partitions;
    +    } else {
    +      for (int i = 0; i < partitions; i++) {
    +        if (comparator.compareTo(key, bounds[i])) {
    +          return i;
    +        }
    +      }
    +      return partitions;
    +    }
    +  }
    +
    +  interface Comparator extends Serializable {
    --- End diff --
   
    Do you want a serialization Comparator? Name it `SerializableComparator`


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