github.com/matrixorigin/matrixone@v1.2.0/test/distributed/cases/function/func_json_quote.test (about)

     1  select json_quote('a');
     2  select json_quote('a"');
     3  select json_quote('a"b');
     4  select json_quote(null);
     5  create table t1 (a varchar(10));
     6  insert into t1 values ('a'), ('a"'), ('a"b'), (null);
     7  select json_quote(a) from t1;
     8  select json_quote('xax') from t1;
     9  select json_quote(null) from t1;