Scenario:

Server-A:

CREATE TABLE t (pps INT UNSIGNED);
INSERT INTO t VALUES(4000000000), (4000000000);

Server-B:

CREATE TABLE d_test ENGINE=CONNECT TABLE_TYPE=MYSQL DBNAME=db OPTION_LIST='host=127.0.0.1,port=3337,user=user,password=password' SRCDEF='
SELECT SUM(pps)
FROM (SELECT SUM(pps) as pps FROM (
SELECT SUM( pps ) as pps FROM t) t
) AS S1';

Actual result:
Engine CONNECT failed to discover table db.d_test

The problem appears on the following conditions:
1) Two nested queries
2) Sum of values more than 4 bytes
3) Using aggregate functions in nested queries (SUM, AVG).