code: @Override
    public OperationHandle getColumns(SessionHandle sessionHandle,
        String catalogName, String schemaName, String tableName, String columnName)
            throws HiveSQLException {
      OperationHandle opHandle = sessionManager.getSession(sessionHandle)
          .getColumns(catalogName, schemaName, tableName, columnName);
      LOG.debug(sessionHandle + ": getColumns()");
      return opHandle;
    }
docs: /* (non-Javadoc)
  @see org.apache.hive.service.cli.ICLIService#getColumns(org.apache.hive.service.cli.SessionHandle)