Re: [PATCH] Optimize json_lex_string by batching character copying

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