@Override
  public int getFetchSize() throws SQLException {
    if (isClosed) {
      throw new SQLException("Resultset is closed");
    }
    return fetchSize;
  }
Moves the cursor down one row from its current position.

@see java.sql.ResultSet#next()
@throws SQLException
          if a database access error occurs.
jdbc/src/java/org/apache/hive/jdbc/HiveQueryResultSet.java