connect master,127.0.0.1,root,,test,$MASTER_MYPORT,; connect slave,127.0.0.1,root,,test,$SLAVE_MYPORT,; connection master; CREATE DATABASE federated; connection slave; CREATE DATABASE federated; connection default; # # MDEV-14907 FEDERATEDX doesn't respect DISTINCT # CREATE TABLE t1 ( `foo_id` bigint(20) unsigned NOT NULL, `foo_name` varchar(255) DEFAULT NULL, `parent_foo_id` bigint(20) unsigned DEFAULT NULL, PRIMARY KEY (`foo_id`), KEY `foo_name` (`foo_name`), KEY `parent_foo_id` (`parent_foo_id`) ) DEFAULT CHARSET=utf8; CREATE TABLE `fed_t1` ENGINE=FEDERATED DEFAULT CHARSET=utf8 CONNECTION='mysql://root@127.0.0.1:MASTER_PORT/test/t1'; INSERT INTO t1 VALUES (968903, 'STRING - 0', 822857); INSERT INTO t1 VALUES (968953, 'STRING - 1', 822857); INSERT INTO t1 VALUES (971603, 'STRING - 2', 822857); INSERT INTO t1 VALUES (971803, 'STRING - 3', 822857); INSERT INTO t1 VALUES (975103, 'STRING - 4', 822857); INSERT INTO t1 VALUES (822857, 'STRING', NULL); select foo_id,parent_foo_id,foo_name from t1 where parent_foo_id = 822857 or foo_name like 'STRING%'; foo_id parent_foo_id foo_name 968903 822857 STRING - 0 968953 822857 STRING - 1 971603 822857 STRING - 2 971803 822857 STRING - 3 975103 822857 STRING - 4 822857 NULL STRING explain select foo_id,parent_foo_id,foo_name from fed_t1 where parent_foo_id = 822857 or foo_name like 'STRING%'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE fed_t1 ALL foo_name,parent_foo_id NULL NULL NULL 6 Using where select foo_id,parent_foo_id,foo_name from fed_t1 where parent_foo_id = 822857 or foo_name like 'STRING%'; foo_id parent_foo_id foo_name 968903 822857 STRING - 0 968953 822857 STRING - 1 971603 822857 STRING - 2 971803 822857 STRING - 3 975103 822857 STRING - 4 822857 NULL STRING DROP TABLE fed_t1, t1; connection master; DROP TABLE IF EXISTS federated.t1; DROP DATABASE IF EXISTS federated; connection slave; DROP TABLE IF EXISTS federated.t1; DROP DATABASE IF EXISTS federated;