1. **Function Modification**: The `write_time_detail` function has been refactored into `merge_time_detail` to modify the behavior of merging time details instead of overwriting them. The `merge_time_detail` function now adds new values to the existing ones, preserving the data and allowing for cumulative updates, which ensures more accurate tracking of time metrics.
2. **Usage of New Function**: All instances where `write_time_detail` was called have been updated to use `merge_time_detail`, including in the `src/coprocessor/endpoint.rs`, `src/server/service/kv.rs`, `src/storage/txn/tracker.rs`, and test files. The modification ensures consistency across the codebase by merging time details rather than replacing them.
3. **Test Coverage**: A new test, `test_select_time_details`, has been added in `tests/integrations/coprocessor/test_select.rs` to validate the proper functioning of time detail merging. The test checks that the `process_wall_time_ns` field is not zero, ensuring the correct time metrics are being tracked and merged.
4. **Backward Compatibility**: The changes do not affect any external functionality or break compatibility. The merging of time details is backward-compatible, as it preserves existing values and adds new ones, which makes the system more flexible for future extensions.
5. **Code Consistency**: The naming convention and function signature have been aligned with existing code practices, making the codebase more consistent and easier to maintain.