m_table.invalidate();
	protected final Tuple peekNext()	throws SQLException	{		if(m_nextRow != null)			return m_nextRow;		SPITupleTable table = this.getTupleTable();		if(table == null)			return null;		if(m_tableRow >= table.getCount() - 1)		{			// Current table is exhaused, get the next			// one.			//			m_table.invalidate();			m_table = null;			table = this.getTupleTable();			if(table == null)				return null;		}		m_nextRow = table.getSlot(++m_tableRow);		return m_nextRow;	}