Just like the pyapi and rapi functions, the first argument is a pointer to the SQL function definition. This pointer is used to retrieve the argument names that were defined in the SQL layer. On the MAL layer you can simply pass the argument "nil:ptr”. This will result in the variables being called “arg1”, “arg2”, etc… See the pyapi MAL tests for more information (sql/backends/monet5/UDF/pyapi/Tests/*.malC).

Mark

On 4 Nov 2018, at 11:53, Renato Marroquín Mogrovejo <renatoj.marroquin@gmail.com> wrote:

Hi all,

I am trying to use the following patten from MAL[1]

pattern eval(fptr:ptr,cpp:bit,expr:str,arg:any...):any...

However, I am not sure how I should create the first parameter <fptr:ptr> from MAL. I am just trying to be able to call a C-UDF from MAL. From capi.c, it would seem that it is the client's context but I don't know how to get a handle of that.
Any pointers are highly appreciated.

Thanks!

Renato M.
[1] https://github.com/MonetDB/MonetDB/blob/2310e49a349ebcb8ff5b5c585928c8f4bd19b2fb/sql/backends/monet5/UDF/capi/capi.mal#L14
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