Make my question clear.

I hope I'm not writing wrong question to the wrong mailing-list.
Let me know if I'm.

I would like to ask when the table reference e.g ( 1234::table1 )
return from the SELECT statment.
e.g.

select col1 from table2
col1
---------
1234

col1 type is now from ( SET?? not sure) table1 converted to oid by seteval
and is there a function can converted this to text or int to preform
calculation?
Thanks
Alex