Incorrect, confusing error message: ERROR 1054 (42S22): Unknown column 't0.c1' in 'field list'

INSTALL PLUGIN Spider SONAME 'ha_spider.so';

CREATE USER Spider@localhost IDENTIFIED BY 'PWD1';

CREATE SERVER srv FOREIGN DATA WRAPPER MYSQL OPTIONS (SOCKET '../socket.sock',DATABASE 'test',user 'Spider',PASSWORD 'PWD1');

CREATE TABLE t (c INT) ENGINE=InnoDB;

CREATE TABLE ts (c1 INT) ENGINE=Spider COMMENT='WRAPPER "mysql",srv "srv",TABLE "t"';

SELECT c1 FROM ts;

10.11.0-dbg>SELECT c1 FROM ts;

ERROR 1054 (42S22): Unknown column 't0.c1' in 'field list'

ERROR 1054 (42S22): Unknown column 'c1' in parent spider table 't'.