Any disadvantages to bit flags in database columns?

Question

Consider the following tables:

CREATE TABLE user_roles(
    pkey         SERIAL PRIMARY KEY,
    bit_id       BIGINT NOT NULL,
    name         VARCHAR(256)         


        

Answer 1

There is at least one huge disadvantage here...

These conditions are non-SARGable!

This is a big one and for me would be a dealbreaker. The bitwise evaluations you need to perform are (to my knowledge) not indexable in any database - the engine needs to check every row to perform the evaluation, which means terrible performance.