How can I get a parameterized bulk version of a scalar C UDF to work in SQL?

Hi,

Say that I have a family of simple scalar transforming function f(x ,p) => y parameterized by p which are implemented as C UDF's and exposed as SQL UDF's. Is it possible to create a bulk version of this?

So the scalar C signature is simplified to something like

char*  f(int* output, int* input, const char** func_parameter);

the mal stuff

module m;

command f(input:int, func_parameter:str):int address f;

and in sql we have

CREATE FUNCTION f(input INT, func_param STRING) RETURNS INT        EXTERNAL NAME m.f;

Now for the bulk version I would like to use

in C:

char* f(bat* output, bat* input, const char** func_parameter);

in MAL:

module batm;

command f(input:bat[:int], func_parameter:str):bat[:int]

address f;

in SQL: reuse the scalar SQL signature.

But that doesn't seem to work. When I compile this and call the udf in a sql query on an actual column, the plan applies the scalar version on each tuple instead of calling the bulk version once. However if I remove the parametrization, i.e. removing the func_parameter from the signature, the bulk version is correctly called.

Aris