QUERY PLAN
GroupAggregate (cost=106.06..106.08 rows=1 width=12)
Group Key: case_id
-> Sort (cost=106.06..106.07 rows=1 width=4)
Sort Key: case_id
-> Seq Scan on tbl_pre_sales (cost=0.00..106.05 rows=1 width=4)
Filter: ((created_by = 1000) AND (case_id = ANY ('{8256,8257,8249,8215,8252,8259,8250,8258,8247,8255}'::integer[])))