Mysql spider引擎将结果行加倍

我有两个mysql服务器“G0”和“G1”。并分别有一个单行测试表

G0：

G1：

然后，我使用MariaDB 10.4提供的spider引擎（

mysqld版本10.4.12-MariaDB-1:10.4.12+maria~bionic log for debian linux gnu on x86_64（MariaDB.org二进制发行版）

）将它们组合成这样：

CREATE TABLE t1 (
   id BIGINT PRIMARY KEY,
   node TEXT
) ENGINE=Spider
COMMENT='wrapper "mysql"'
PARTITION BY HASH (id) (
 PARTITION par0 COMMENT = 'srv "G0", tbl "t1"',
 PARTITION par1 COMMENT = 'srv "G1", tbl "t1"'
);

MariaDB [(none)]> select * from test.t1;
+-----+--------+
| id  | node   |
+-----+--------+
|   1 | DB-G0  |
|   2 | DB-G1  |
+-----+--------+
2 rows in set (0.013 sec)

对于这样的简单查询，它工作得很好：

CREATE TABLE t1 (
   id BIGINT PRIMARY KEY,
   node TEXT
) ENGINE=Spider
COMMENT='wrapper "mysql"'
PARTITION BY HASH (id) (
 PARTITION par0 COMMENT = 'srv "G0", tbl "t1"',
 PARTITION par1 COMMENT = 'srv "G1", tbl "t1"'
);

MariaDB [(none)]> select * from test.t1;
+-----+--------+
| id  | node   |
+-----+--------+
|   1 | DB-G0  |
|   2 | DB-G1  |
+-----+--------+
2 rows in set (0.013 sec)

但在使用这种条件时，结果翻了一番：

MariaDB [(none)]> select * from test.t1 where id != 0;
+-----+--------+
| id  | node   |
+-----+--------+
|   1 | DB-G0  |
|   2 | DB-G1  |
|   1 | DB-G0  |
|   2 | DB-G1  |
+-----+--------+
4 rows in set (0.017 sec)

以下是我的蜘蛛相关设置：

#
# * Spider
#
spider_bulk_update_mode      = 2
spider_bulk_update_size      = 512K
spider_bulk_size             = 512K
spider_conn_wait_timeout     = 5
spider_connect_timeout       = 3
spider_direct_dup_insert     = 1
spider_direct_order_limit    = 1
spider_multi_split_read      = 1
spider_net_read_timeout      = 5
spider_net_write_timeout     = 5
spider_quick_mode            = 3
spider_quick_page_size       = 1000
spider_remote_trx_isolation  = 1
spider_support_xa            = 0

spider_remote_time_zone        = +00:00
spider_remote_access_charset   = utf8mb4
spider_remote_autocommit       = 1
spider_remote_default_database = 0

spider_general_log          = 1
spider_internal_sql_log_off = 0
spider_log_result_errors    = 4

---

我的设置有问题吗？还是有错误？

我注释掉了上面所有的设置，然后重试，结果是一样的。我注释掉了上面所有的设置，然后重试，结果是一样的。