QUERY PLAN
GroupAggregate (cost=27.51..30.65 rows=1 width=44)
Group Key: c.client_id
-> Hash Right Join (cost=27.51..30.63 rows=1 width=20)
Hash Cond: (tbl_pre_sales.case_id = c.id)
-> HashAggregate (cost=13.60..15.30 rows=113 width=20)
Group Key: tbl_pre_sales.case_id
-> Seq Scan on tbl_pre_sales (cost=0.00..12.40 rows=120 width=24)
Filter: (NOT is_draft)
-> Hash (cost=13.90..13.90 rows=1 width=8)
-> Seq Scan on tbl_cases c (cost=0.00..13.90 rows=1 width=8)
Filter: ((case_type = 1) AND (client_id = 1))