Hello, Documentation says : ( http://www.postgresql.org/docs/9.5/static/textsearch-controls.html#TEXTSEARCH-RANKING ) "The built-in ranking functions are only examples. You can write your own ranking functions and/or combine their results with additional factors to fit your specific needs."
The build-in seems not enough for my use case. How to write my own ranking functions ? I would like to create something like ts_rank_cd( tsv, 'foo & bar', my_new_ normalization_integer) ---- pg 9.5
