QUERY PLAN
Sort (cost=184130.84..184130.84 rows=1 width=322)
Sort Key: fns.nspname, fc.relname, a.attnum
-> Nested Loop Left Join (cost=74.95..184130.83 rows=1 width=322)
-> Nested Loop Left Join (cost=74.53..184130.39 rows=1 width=289)
-> Nested Loop Left Join (cost=74.40..184130.23 rows=1 width=229)
-> Nested Loop (cost=74.11..184129.93 rows=1 width=161)
Join Filter: (c.oid = a.attrelid)
-> Nested Loop (cost=73.69..184128.56 rows=3 width=126)
Join Filter: (c.relnamespace = ns.oid)
-> Seq Scan on pg_namespace ns (cost=0.00..1.07 rows=1 width=4)
Filter: (nspname = 'a57be577deb434'::name)
-> Hash Join (cost=73.69..184126.64 rows=68 width=130)
Hash Cond: (ct.conrelid = c.oid)
-> ProjectSet (cost=0.00..52702.42 rows=10404000 width=123)
-> Seq Scan on pg_constraint ct (cost=0.00..604.39 rows=10404 width=118)
Filter: (contype = 'f'::"char")
-> Hash (cost=73.44..73.44 rows=20 width=8)
-> Bitmap Heap Scan on pg_class c (cost=4.57..73.44 rows=20 width=8)
Recheck Cond: (relname = 'tbl_users'::name)
-> Bitmap Index Scan on pg_class_relname_nsp_index (cost=0.00..4.56 rows=20 width=0)
Index Cond: (relname = 'tbl_users'::name)
-> Index Scan using pg_attribute_relid_attnum_index on pg_attribute a (cost=0.42..0.44 rows=1 width=70)
Index Cond: ((attrelid = ct.conrelid) AND (attnum = (ct.conkey)[(generate_subscripts(ct.conkey, 1))]))
-> Index Scan using pg_class_oid_index on pg_class fc (cost=0.29..0.31 rows=1 width=72)
Index Cond: (oid = ct.confrelid)
-> Index Scan using pg_namespace_oid_index on pg_namespace fns (cost=0.13..0.15 rows=1 width=68)
Index Cond: (fc.relnamespace = oid)
-> Index Scan using pg_attribute_relid_attnum_index on pg_attribute fa (cost=0.42..0.44 rows=1 width=70)
Index Cond: ((attrelid = ct.confrelid) AND (attnum = (ct.confkey)[(generate_subscripts(ct.conkey, 1))]))