Unable to process more than 11 function columns in SELECT Query MySQL

```
SELECT SUM(t1.a*t2.b), AVG(t2.a-t1.b), SUM(t2.b/t1.a), COUNT(t2.a+t1.b), AVG(t2.a*t1.b), SUM(t1.b-t2.a), COUNT(t2.a*t1.b), AVG(t2.a/t1.b),SUM(t1.b+t2.a), COUNT(t1.b/t2.a), AVG(t1.b-t2.a), SUM(b*t1.t2.a)
FROM t1, t2;

```
> ERROR 13180 (HY000): Unknown column 't1.a' in 'field list'

Ambiguous Error Statement is returned when number of function columns exceed 11 in SELECT Query in MySQL.
