Naomi,

>1) The select would be too complex
There is not a SQL statement complex enough that Sergey wouldn't be able to make it work <g>

>2) What should I do for my grid? Add extra column on the fly? How about sorting (my grid class allows sorting)?
Why not? Of course that would depend on your implementation of the sorting class, but I do not see a problem (of course I do not like to mention I am very short-sighted)

>3) What if we would like to add a new field, which I didn't specify in my cursor?
This might be a problem for you will need to ask Sergey again how to build the new SQL statement <g>

[Update]By the way, if adding a field changes radically the select statement, then you can not only use some way of configuring which fields the user wants for you will need a different SQL depending on those fields, so the item 3 remains complex, I think[/update]