Function MergeMapValues

be/src/util/container-util.h:251–261

/// native types or support operator +=.
template<typename MAP_TYPE>
void MergeMapValues(const MAP_TYPE& src, MAP_TYPE* dst) {
  for (typename MAP_TYPE::const_iterator src_it = src.begin();
      src_it != src.end(); ++src_it) {
    typename MAP_TYPE::iterator dst_it = dst->find(src_it->first);
    if (dst_it == dst->end()) {
      (*dst)[src_it->first] = src_it->second;
    } else {
      dst_it->second += src_it->second;
    }
  }
}

} // end namespace impala