Type map query from rails 6.1.7

rails6-type-map-query.sql

SELECT t.oid, t.typname, t.typelem, t.typdelim, t.typinput, r.rngsubtype, t.typtype, t.typbasetype
	FROM pg_type as t
	LEFT JOIN pg_range as r ON oid = rngtypid
	WHERE
	  t.typname IN ('int2', 'int4', 'int8', 'oid', 'float4', 'float8', 'text', 'varchar', 'char', 'name', 'bpchar', 'bool', 'bit', 'varbit', 'timestamptz', 'date', 'money', 'bytea', 'point', 'hstore', 'json', 'jsonb', 'cidr', 'inet', 'uuid', 'xml', 'tsvector', 'macaddr', 'citext', 'ltree', 'line', 'lseg', 'box', 'path', 'polygon', 'circle', 'time', 'timestamp', 'numeric', 'interval')
	  OR t.typtype IN ('r', 'e', 'd')
	  OR t.typinput = 'array_in(cstring,oid,integer)'::regprocedure
	  OR t.typelem != 0

Result using EXPLAIN (ANALYZE, BUFFERS)

Hash Left Join  (cost=1.14..44650.38 rows=310104 width=86) (actual time=0.016..355.018 rows=203911 loops=1)
  Hash Cond: (t.oid = r.rngtypid)
  Buffers: shared hit=11089
  ->  Seq Scan on pg_type t  (cost=0.00..43835.21 rows=310104 width=82) (actual time=0.005..319.475 rows=203911 loops=1)
        Filter: ((typname = ANY ('{int2,int4,int8,oid,float4,float8,text,varchar,char,name,bpchar,bool,bit,varbit,timestamptz,date,money,bytea,point,hstore,json,jsonb,cidr,inet,uuid,xml,tsvector,macaddr,citext,ltree,line,lseg,box,path,polygon,circle,time,timestamp,numeric,interval}'::name[])) OR (typtype = ANY ('{r,e,d}'::"char"[])) OR ((typinput)::oid = '750'::oid) OR (typelem <> '0'::oid))
        Rows Removed by Filter: 273344
        Buffers: shared hit=11088
  ->  Hash  (cost=1.06..1.06 rows=6 width=8) (actual time=0.005..0.006 rows=6 loops=1)
        Buckets: 1024  Batches: 1  Memory Usage: 9kB
        Buffers: shared hit=1
        ->  Seq Scan on pg_range r  (cost=0.00..1.06 rows=6 width=8) (actual time=0.002..0.003 rows=6 loops=1)
              Buffers: shared hit=1
Planning:
  Buffers: shared hit=12
Planning Time: 0.347 ms
Execution Time: 363.835 ms

Upgrading to PostgreSQL 14 improved the performance:

Hash Left Join  (cost=1.24..19250.87 rows=306858 width=86) (actual time=0.016..138.272 rows=205837 loops=1)
  Hash Cond: (t.oid = r.rngtypid)
  Buffers: shared hit=9147
  ->  Seq Scan on pg_type t  (cost=0.10..18444.22 rows=306858 width=82) (actual time=0.007..101.006 rows=205837 loops=1)
        Filter: ((typname = ANY ('{int2,int4,int8,oid,float4,float8,text,varchar,char,name,bpchar,bool,bit,varbit,timestamptz,date,money,bytea,point,hstore,json,jsonb,cidr,inet,uuid,xml,tsvector,macaddr,citext,ltree,line,lseg,box,path,polygon,circle,time,timestamp,numeric,interval}'::name[])) OR (typtype = ANY ('{r,e,d}'::"char"[])) OR ((typinput)::oid = '750'::oid) OR (typelem <> '0'::oid))
        Rows Removed by Filter: 184826
        Buffers: shared hit=9146
  ->  Hash  (cost=1.06..1.06 rows=6 width=8) (actual time=0.004..0.006 rows=6 loops=1)
        Buckets: 1024  Batches: 1  Memory Usage: 9kB
        Buffers: shared hit=1
        ->  Seq Scan on pg_range r  (cost=0.00..1.06 rows=6 width=8) (actual time=0.002..0.003 rows=6 loops=1)
              Buffers: shared hit=1
Planning:
  Buffers: shared hit=12
Planning Time: 0.338 ms
Execution Time: 147.277 ms