org.apache.hadoop.hive.ql.metadata.DummyPartition Maven / Gradle / Ivy

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/**
 * 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.metadata;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hive.metastore.api.FieldSchema;

/**
 * A Hive Table Partition: is a fundamental storage unit within a Table. Currently, Hive does not support
 * hierarchical partitions - For eg: if partition ds=1, hr=1 exists, there is no way to access ds=1
 *
 * Hierarchical partitions are needed in some cases, for eg. locking. For now, create a dummy partition to
 * satisfy this
 */
public class DummyPartition extends Partition {

  @SuppressWarnings("nls")
  static final private Log LOG = LogFactory
      .getLog("hive.ql.metadata.DummyPartition");

  private String name;
  private LinkedHashMap partSpec;
  public DummyPartition() {
  }
  
  public DummyPartition(Table tbl, String name) throws HiveException {
    setTable(tbl);
    this.name = name;
  }  

  public DummyPartition(Table tbl, String name,
      Map partSpec) throws HiveException {
    setTable(tbl);
    this.name = name;
    this.partSpec = new LinkedHashMap(partSpec);
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public String getCompleteName() {
    return getName();
  }

  @Override
  public LinkedHashMap getSpec() {
    return partSpec;
  }

  @Override
  public List getValues() {
    List values = new ArrayList();
    for (FieldSchema fs : this.getTable().getPartCols()) {
      values.add(partSpec.get(fs.getName()));
    }
    return values;
  }

}