QUERY PLAN
GroupAggregate (cost=112.94..112.96 rows=1 width=12)
Group Key: case_id
-> Sort (cost=112.94..112.94 rows=1 width=4)
Sort Key: case_id
-> Seq Scan on tbl_pre_sales (cost=0.00..112.93 rows=1 width=4)
Filter: ((created_by = 1000) AND (case_id = ANY ('{9277,9276,9275,9274,9273,9272,9271,9270,9269,9268}'::integer[])))