Query wp – Show posts with a specific category or aithor

I am creating a personalized feed for the users on my website, where everyone can follow the users and categories and see their posts. I'm not sure how.

I have tried to use author__in and category__ in, however, it only shows the publications in which both conditions are met.

I want something like this

$ args = array (
& # 39; relationship & # 39; => & # 39; O & # 39 ;,
training(
& # 39; category__in & # 39; => array (1,2,3)
)
training(
& # 39; author__in & # 39; => array (1,2,3)
)
)

I read the answer here How to consult publications of authors and specific categories using WP_query?
But the solution is to make an AND call.

Is it possible to do something like & # 39; IF cat = 1,2,3 OR aut = 1,2,3 & # 39; with SQL.