If they are defined, they can override table-level settings.
time(nullptr),
                    max_volume_index,
                    is_insert,
                    getStoragePolicy()->getDiskByName(selected_disk_name));
            else
                reserved_space = tryReserveSpace(part_size, getStoragePolicy()->getDiskByName(selected_disk_name));
            if (reserved_space)
            {
                currently_emerging_big_parts.emplace(
                    part_name, EmergingPartInfo{reserved_space->getDisk(0)->getName(), part_info.partition_id, part_size});
                for (const auto & part : covered_parts)
                {
                    if (currently_submerging_big_parts.contains(part))
                        LOG_WARNING(log, "currently_submerging_big_parts contains duplicates. JBOD might lose balance");
                    else
                        currently_submerging_big_parts.insert(part);
                }
                /
                tagger_ptr->emplace(*this, part_name, std::move(covered_parts), log);
            }
        }
    }
    catch (...)
    {
        LOG_DEBUG(log, "JBOD balancer encounters an error. Fallback to random disk selection");
        tryLogCurrentException(log);
    }
    return reserved_space;
}
ColumnsDescription MergeTreeData::getObjectColumns(