Hi, In the extension I'm developing (https://bitbucket.org/luciad/libgpkg) I'm currently adding support for queries like: select Distance( GeomFromText('Point(13.457 3)'), geometry ) from table;
GeomFromText takes a string and outputs a geometry blob Distance takes two geometry blobs and returns a double In order to speed up the distance function I was wondering if I could use aux_data to cache the parsed version of the first parameter since this remains the same for every call. So far I haven't been able to get this to work though, aux_data is always NULL, no matter what I try. My hunch is that this is because the first parameter is the result of a function call which could in theory return different values for each row even if the input parameters are constant. Is that correct? Are there any other ways to kind of memoize the GeomFromText function (or the parameters to distance) besides aux_data? Thanks, Pepijn _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
