QUERY PLAN
GroupAggregate (cost=867.55..867.73 rows=8 width=44)
Group Key: c.project_id
-> Sort (cost=867.55..867.57 rows=8 width=20)
Sort Key: c.project_id
-> Hash Right Join (cost=693.61..867.43 rows=8 width=20)
Hash Cond: (tbl_implement_records.case_id = c.id)
-> HashAggregate (cost=381.98..476.36 rows=6292 width=20)
Group Key: tbl_implement_records.case_id
-> Seq Scan on tbl_implement_records (cost=0.00..316.00 rows=6598 width=24)
Filter: (NOT is_draft)
-> Hash (cost=311.52..311.52 rows=8 width=8)
-> Seq Scan on tbl_cases c (cost=0.00..311.52 rows=8 width=8)
Filter: ((case_type = 2) AND (project_id = ANY ('{3960,3958,3959,1791}'::integer[])))