Unsigned Integer overflow for negative value instead of 0

Inserting a negative integer through the columnstore API which is mapped to a unsigned integer field results in a positive result instead of 0.

If inserting the same value through SQL it is masked to 0.

Reproducible by changing lines 73 and 92 of dataconvert-int.cpp to:

bulk->setColumn(2, (uint64_t) -1);

and

ASSERT_STREQ(row[2], "0");