JSON_EXTRACT as select conditions triggers syntax errors on Spider

mysql> SHOW CREATE TABLE t1\G

*************************** 1. row ***************************

       Table: t1

Create Table: CREATE TABLE `t1` (

  `i` int(11) NOT NULL,

  `jdoc` longtext CHARACTER SET utf8mb4 COLLATE utf8mb4_bin DEFAULT NULL,

  PRIMARY KEY (`i`)

) ENGINE=SPIDER DEFAULT CHARSET=latin1

 PARTITION BY LIST (`i` MOD 4)

(PARTITION `pt0` VALUES IN (0) COMMENT = 'database "yxtest", table "t1", server "SPT0"' ENGINE = SPIDER,

 PARTITION `pt1` VALUES IN (1) COMMENT = 'database "yxtest", table "t1", server "SPT1"' ENGINE = SPIDER,

 PARTITION `pt2` VALUES IN (2) COMMENT = 'database "yxtest", table "t1", server "SPT2"' ENGINE = SPIDER,

 PARTITION `pt3` VALUES IN (3) COMMENT = 'database "yxtest", table "t1", server "SPT3"' ENGINE = SPIDER)

1 row in set (0.00 sec)

mysql> INSERT INTO t1 VALUES(1, '{"Name":"Tom", "Age":18}'), (2, '{"Name":"Jerry", "Age":20}');

Query OK, 2 rows affected (0.00 sec)

Records: 2  Duplicates: 0  Warnings: 0

mysql> SELECT * FROM t1 WHERE json_extract(jdoc, '$.Age')=20;

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'json_extract '$.Age') = 20)' at line 1