I think that's going to take some custom code, which would be simpler if the custom tables were xPDO-friendly.
This might be relevant:
http://bobsguides.com/custom-db-tables.html
Hello Bob,
The tables are xPDO-friendly.
There is no way to integrate that with a search-package that merge all the results?
Do you know if its possible with xPDO to create MySQL views, otherwise i need to get all the results in one time to sort by relevance.
I think that's going to be very slow.
Is a custom driver for SimpleSearch a option? We don't have Solr enabled on our server, so i can't use that.