made extended search functional with the following properties:

not working at all: title type (something wrong with query, cant bind objects), genre, budget
fully working: keyword, match types, prod year, runtime, votes, rating

problematic: cast and character
character somehow causes wrong results even though the query looks correct
cast: keywords need to be split up (just like main keyword), example: %James Cameron% not found, because in DB: "Cameron, James"