private RowSet prepareFromRow(final List<Object> rows, final RowSet rowSet) throws Exception {
    rows.forEach(row -> rowSet.addRow((Object[]) row));
    return rowSet;
  }
Returns the current UGI on the stack

@return UserGroupInformation

@throws HiveSQLException
service/src/java/org/apache/hive/service/cli/operation/SQLOperation.java