User Defined Function

[Bácskai Gergő]

Dear all

How can I make a user defined function (written in C/C++) what returns a
row or rowset / result set (like "show open tables")

for example select udf(1,'par2') what returns
C1  |  C2  | C3
----+------+-----
1   |  2   | A
2   |  3   | B
3   |  4   | C

Thanks Gergő