QUERY PLAN
GroupAggregate (cost=693.05..871.86 rows=2 width=44)
Group Key: c.project_id
-> Hash Right Join (cost=693.05..871.82 rows=2 width=20)
Hash Cond: (tbl_implement_records.case_id = c.id)
-> HashAggregate (cost=394.56..491.62 rows=6471 width=20)
Group Key: tbl_implement_records.case_id
-> Seq Scan on tbl_implement_records (cost=0.00..326.79 rows=6777 width=24)
Filter: (NOT is_draft)
-> Hash (cost=298.46..298.46 rows=2 width=8)
-> Seq Scan on tbl_cases c (cost=0.00..298.46 rows=2 width=8)
Filter: ((case_type = 2) AND (project_id = 4005))