void ExceptIntersectSetOperator::intersectTupleMaps(TupleMap& map_a, TupleMap& map_b) {
TupleMap::iterator it_a = map_a.begin();
while(it_a != map_a.end()) {
TupleMap::iterator it_b = map_b.find(it_a->first);
if (it_b == map_b.end()) {
it_a = map_a.erase(it_a);
} else {
it_a->second = std::min(it_a->second, it_b->second);
++it_a;
}
}
}
void ExceptIntersectSetOperator::exceptTupleMaps(TupleMap& map_a, TupleMap& map_b) {
TupleMap::iterator it_a = map_a.begin();
while(it_a != map_a.end()) {
TupleMap::iterator it_b = map_b.find(it_a->first);
if (it_b != map_b.end()) {
if (it_a->second > it_b->second) {
it_a->second -= it_b->second;
}
else {
it_a = map_a.erase(it_a);
continue;
}
}
++it_a;
}
}