INSERT INTO tinyint of CONNECT.JSON brings NULL

--------------

create table t1(

	 i1 int,

        i2 int,

        i3 int

)engine=CONNECT table_type=JSON  File_name='/home/alice/Downloads/3.json'

--------------

Query OK, 0 rows affected (0.07 sec)

--------------

insert into t1 values(1,1,1)

--------------

Query OK, 1 row affected (0.00 sec)

--------------

select * from t1

--------------

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

| i1   | i2   | i3   |

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

|    1 |    1 |    1 |

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

1 row in set (0.00 sec)

--------------

create table t2(

	    i1 tinyint,

        i2 tinyint,

        i3 tinyint

)engine=CONNECT table_type=JSON  File_name='/home/alice/Downloads/3.json'

--------------

Query OK, 0 rows affected (0.06 sec)

--------------

select * from t2

--------------

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

| i1   | i2   | i3   |

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

|    1 |    1 |    1 |

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

1 row in set (0.00 sec)

--------------

insert into t2 values(1,1,1)

--------------

Query OK, 1 row affected (0.00 sec)

--------------

select * from t2

--------------

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

| i1   | i2   | i3   |

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

|    1 |    1 |    1 |

| NULL | NULL | NULL |

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

2 rows in set (0.00 sec)