Hi, I ran this test.
DROP TABLE IF EXISTS long_json_as_text; CREATE TABLE long_json_as_text AS with long as ( select repeat(description, 11) from pg_description ) select (select json_agg(row_to_json(long))::text as t from long) from generate_series(1, 100); VACUUM FREEZE long_json_as_text; select 1 from long_json_as_text where t::json is null; head: Time: 161,741ms v5: Time: 270,298 ms ubuntu 64 bits gcc 9.4.0 Am I missing something? regards, Ranier Vilela