JSON_TABLE: Queries are not inserted into query cache

drop table if exists t;

create table t (a text);

insert into t values ('{"a":"foo"}');

set global query_cache_type= on;

set query_cache_type= on;

reset query cache;

flush status;

select * from t, json_table(t.a, '$' columns (f varchar(20) path '$.a')) as jt;

show status like 'qcache%';

MariaDB [test]> show status like 'qcache%';

+-------------------------+---------+

| Variable_name           | Value   |

+-------------------------+---------+

| Qcache_free_blocks      | 1       |

| Qcache_free_memory      | 1031064 |

| Qcache_hits             | 0       |

| Qcache_inserts          | 0       |

| Qcache_lowmem_prunes    | 0       |

| Qcache_not_cached       | 1       |

| Qcache_queries_in_cache | 0       |

| Qcache_total_blocks     | 1       |

+-------------------------+---------+

MariaDB [test]> select * from t;

+-------------+

| a           |

+-------------+

| {"a":"foo"} |

+-------------+

1 row in set (0.003 sec)

MariaDB [test]> show status like 'qcache%';

+-------------------------+---------+

| Variable_name           | Value   |

+-------------------------+---------+

| Qcache_free_blocks      | 1       |

| Qcache_free_memory      | 1029528 |

| Qcache_hits             | 0       |

| Qcache_inserts          | 1       |

| Qcache_lowmem_prunes    | 0       |

| Qcache_not_cached       | 1       |

| Qcache_queries_in_cache | 1       |

| Qcache_total_blocks     | 4       |

+-------------------------+---------+

8 rows in set (0.008 sec)