perf: optimize tables query (#542)

Author: aokiji

.sqlx/query-aced4382cedbfc359bb1c1ab71cf2472fa8afc0b24bf02ee1bfdfdbf111acfc8.json renamed to .sqlx/query-2b27b190ecaed2d961577fcaaf5875a1842ca09da63a7fe68996409e21e7f779.json

@@ -11,16 +11,15 @@ select
  when c.relreplident = 'f' then 'FULL'
  else 'NOTHING'
  end as "replica_identity!",
- pg_total_relation_size(format('%I.%I', nc.nspname, c.relname)) :: int8 as "bytes!",
- pg_size_pretty(
- pg_total_relation_size(format('%I.%I', nc.nspname, c.relname))
- ) as "size!",
+ relation_size:: int8 as "bytes!",
+ pg_size_pretty(relation_size) as "size!",
  pg_stat_get_live_tuples(c.oid) as "live_rows_estimate!",
  pg_stat_get_dead_tuples(c.oid) as "dead_rows_estimate!",
  obj_description(c.oid) as comment
 from
  pg_namespace nc
  join pg_class c on nc.oid = c.relnamespace
+ cross join lateral pg_total_relation_size(c.oid) relation_size
 where
  c.relkind in ('r', 'p', 'v', 'm')
  and not pg_is_other_temp_schema(nc.oid)
@@ -32,11 +31,3 @@ where
  )
  or has_any_column_privilege(c.oid, 'SELECT, INSERT, UPDATE, REFERENCES')
  )
-group by
- c.oid,
- c.relname,
- c.relkind,
- c.relrowsecurity,
- c.relforcerowsecurity,
- c.relreplident,
- nc.nspname;