When expression results in data overflow, no error or warning was returned

When aggregate functions result in a value larger than what Calpont can handle,
an overflow error is returned. But for expression in the projection results in
an overflow, it will just return whatever values there is, without error or
warnings. The user, or automated result checker, will not be able to know
if such condition has occurred and will get the incorrect data.

The same also occurs to the expression in the where caluse. Incorrect result
will be returned.

Example of overflow:

create table t1 (col1 decimal(6,4)) engine=infinidb;
insert into t1 values (10.0001);
select col1*2.0002*2.0000002*0.999999999999 from t1;