dhtmlxgrid+connector_java+dataprocessor,how to add a column

dhtmlxgrid+connector_java+dataprocessor,when rend_table,i use three column,but i need addition column in the grid for other function ,how to achieve it?
thanks for dear support!


The client side grid can have bigger column count, than server side connector - in such case not used columns just will be empty.

Also, you can user render_sql with fake columns ( select *, 0 as dummy1 from table ) and use such fake columns inside field list