Simply display zero if it's less or equals to 0.
auto & dst_column_name = typeid_cast<ColumnString &>(*mutable_columns[name_pos["name"]]
    auto & dst_array_value = typeid_cast<ColumnInt64 &>(*mutable_columns[name_pos["value"]]).getData(
    const auto & src_column_host_name = typeid_cast<const ColumnString &>(*src.getByName("host_name").column
    const auto & src_array_current_time = typeid_cast<const ColumnUInt32 &>(*src.getByName("current_time").column).getData(
    const auto & src_array_thread_id = typeid_cast<const ColumnUInt64 &>(*src.getByName("thread_id").column).getData(
    const auto & src_column_name = typeid_cast<const ColumnString &>(*src.getByName("name").column
    const auto & src_array_value = typeid_cast<const ColumnInt64 &>(*src.getByName("value").column).getData(
    struct Id
    {
        StringRef name;
        StringRef host_name;
        bool operator<(const Id & rhs) const
        {
            return std::tie(name, host_name)
                 < std::tie(rhs.name, rhs.host_name
        }
    };
    std::map<Id, UInt64> rows_by_name;
    for (size_t src_row = 0; src_row < src.rows( ++src_row)
    {
        Id id{
            src_column_name.getDataAt(src_row),
            src_column_host_name.getDataAt(src_row),
        };
        rows_by_name[id] = src_row;
    }
    /// Filter out snapshots
    std::seer_mask;
    for (size_t i = 0; i < src_array_thread_id.size( ++i)
    {