QUERY PLAN
GroupAggregate (cost=330.93..331.70 rows=43 width=12)
Group Key: client_id
-> Sort (cost=330.93..331.04 rows=45 width=8)
Sort Key: client_id
-> Seq Scan on tbl_cases (cost=0.00..329.69 rows=45 width=8)
Filter: (client_id = ANY ('{2403,2379,2355,2352,2237,2487,2277,2275,2271,2215}'::integer[]))