Snap for 8625096 from 217668be to tm-qpr1-release

    std::optional<uint64_t> last_label_;

    std::shared_ptr<std::vector<CowOperation>> ops_;

    std::shared_ptr<std::vector<uint32_t>> merge_op_blocks_;

    uint64_t merge_op_start_;

    uint64_t merge_op_start_{};

    std::shared_ptr<std::unordered_map<uint32_t, int>> block_map_;

    uint64_t num_total_data_ops_;

    uint64_t num_ordered_ops_to_merge_;

    bool has_seq_ops_;

    uint64_t num_total_data_ops_{};

    uint64_t num_ordered_ops_to_merge_{};

    bool has_seq_ops_{};

    std::shared_ptr<std::unordered_map<uint64_t, uint64_t>> data_loc_;

    ReaderFlags reader_flag_;

};