QUERY PLAN
GroupAggregate (cost=104.16..104.18 rows=1 width=12)
Group Key: case_id
-> Sort (cost=104.16..104.16 rows=1 width=4)
Sort Key: case_id
-> Seq Scan on tbl_pre_sales (cost=0.00..104.15 rows=1 width=4)
Filter: ((created_by = 1000) AND (case_id = ANY ('{8252,8259,8250,8258,8255,8253,8251,8245,8248}'::integer[])))