Problem:
Executing the query in the bugpage pegs CPU in optmized build and
asserts in debug build

Analysis:
The function Gcalc_scan_iterator::pop_suitable_intersection()
is expected to pass all the time. As a result while
for debug build we have an assert for failure case, for optmized build
it keeps looping as we dont check the return value of
pop_suitable_intersection()

Solution:
We are avoiding the assert and also CPU utilization by checking the
return value of the function