private void addPartition(
      String databaseName, String tableName, CatalogProtos.PartitionDescProto partitionDescProto) {
    HiveCatalogStoreClientPool.HiveCatalogStoreClient client = null;
    try {

      client = clientPool.getClient();

      Partition partition = new Partition();
      partition.setDbName(databaseName);
      partition.setTableName(tableName);

      List<String> values = Lists.newArrayList();
      for (CatalogProtos.PartitionKeyProto keyProto : partitionDescProto.getPartitionKeysList()) {
        values.add(keyProto.getPartitionValue());
      }
      partition.setValues(values);

      Table table = client.getHiveClient().getTable(databaseName, tableName);
      StorageDescriptor sd = table.getSd();
      sd.setLocation(partitionDescProto.getPath());
      partition.setSd(sd);

      client.getHiveClient().add_partition(partition);
    } catch (Exception e) {
      throw new TajoInternalError(e);
    } finally {
      if (client != null) {
        client.release();
      }
    }
  }
  private void dropPartition(
      String databaseName, String tableName, CatalogProtos.PartitionDescProto partitionDescProto) {
    HiveCatalogStoreClientPool.HiveCatalogStoreClient client = null;
    try {

      client = clientPool.getClient();

      List<String> values = Lists.newArrayList();
      for (CatalogProtos.PartitionKeyProto keyProto : partitionDescProto.getPartitionKeysList()) {
        values.add(keyProto.getPartitionValue());
      }
      client.getHiveClient().dropPartition(databaseName, tableName, values, true);
    } catch (Exception e) {
      throw new TajoInternalError(e);
    } finally {
      if (client != null) {
        client.release();
      }
    }
  }
  @Override
  public CatalogProtos.PartitionDescProto getPartition(
      String databaseName, String tableName, String partitionName) throws CatalogException {
    HiveCatalogStoreClientPool.HiveCatalogStoreClient client = null;
    CatalogProtos.PartitionDescProto.Builder builder = null;

    try {
      client = clientPool.getClient();

      Partition partition =
          client.getHiveClient().getPartition(databaseName, tableName, partitionName);
      builder = CatalogProtos.PartitionDescProto.newBuilder();
      builder.setPartitionName(partitionName);
      builder.setPath(partition.getSd().getLocation());

      String[] partitionNames = partitionName.split("/");

      for (int i = 0; i < partition.getValues().size(); i++) {
        String value = partition.getValues().get(i);
        CatalogProtos.PartitionKeyProto.Builder keyBuilder =
            CatalogProtos.PartitionKeyProto.newBuilder();

        String columnName = partitionNames[i].split("=")[0];
        keyBuilder.setColumnName(columnName);
        keyBuilder.setPartitionValue(value);
        builder.addPartitionKeys(keyBuilder);
      }
    } catch (NoSuchObjectException e) {
      return null;
    } catch (Exception e) {
      throw new TajoInternalError(e);
    } finally {
      if (client != null) {
        client.release();
      }
    }
    return builder.build();
  }