I would like to connect to a FB2.1 database and run an aggregate query
which returns mean and standard deviation. Is it possible to write a
UDF which can take part in such a query. If so, what is passed to the
UDF which would need an array of unspecified size

the query would be something like

select avg(uv), stdev(uv) from results where step = 1 ;

where stdev is the udf

marc