create database db;
use db;
create table t (a text);
insert into t values ('{"foo":"bar"}');
create user u@localhost;
grant select (a) on db.t to u@localhost;
connect  con1,localhost,u,,db;
select a from t;
a
{"foo":"bar"}
select * from t, json_table(t.a, '$' columns(f varchar(20) path '$.foo')) as jt;
a	f
{"foo":"bar"}	bar
select * into outfile 'f' from json_table('[]', '$' columns(x for ordinality)) q;
ERROR 28000: Access denied for user 'u'@'localhost' (using password: NO)
connection default;
disconnect con1;
drop user u@localhost;
drop database db;
use test;