Merge "Use insert() with ranges instead of reserve"

        std::sort(other_ops.begin(), other_ops.end(), std::greater<int>());

    }

    merge_op_blocks->reserve(merge_op_blocks->size() + other_ops.size());

    for (auto block : other_ops) {

        merge_op_blocks->emplace_back(block);

    }

    merge_op_blocks->insert(merge_op_blocks->end(), other_ops.begin(), other_ops.end());

    num_total_data_ops_ = merge_op_blocks->size();

    if (header_.num_merge_ops > 0) {