After a restart and seq disabled for session with no other load (same for
plan with seq enabled).
Bitmap Heap Scan on t_user user0_ (cost=19567.17..58623.03 rows=800678
width=761) (actual time=0.370..0.702 rows=36 loops=1)
Recheck Cond: (upper((username)::text) = ANY ('{[redacted]'::text[]))
Heap Blocks: exact=36
-> Bitmap Index Scan on idx_t_user__username__upper
(cost=0.00..19364.50 rows=800678 width=0) (actual time=0.356..0.356
rows=36 loops=1)
Index Cond: (upper((username)::text) = ANY ('{redacted}'::text[]))
Planning Time: 1.187 ms
Execution Time: 1.067 ms