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* feat/add-sst-file-num-in-region-stat: ### Add SST File Count to Region Statistics - **Enhancements**: - Added `sst_num` to track the number of SST files in region statistics across multiple modules. - Updated `RegionStat` and `RegionStatistic` structs in `datanode.rs` and `region_engine.rs` to include `sst_num`. - Modified `MitoRegion` and `SstVersion` in `region.rs` and `version.rs` to compute and return the number of SST files. - Adjusted test cases in `collect_leader_region_handler.rs`, `failure_handler.rs`, `region_lease_handler.rs`, and `weight_compute.rs` to initialize `sst_num`. - Updated `get_region_statistic` in `utils.rs` to sum `sst_num` from metadata and data statistics. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com> * feat/add-sst-file-num-in-region-stat: Add `sst_num` to `region_statistics` - Updated `region_statistics.rs` to include a new constant `SST_NUM` and added it to the schema and builder structures. - Modified `information_schema.result` to reflect the addition of `sst_num` in the `region_statistics` table. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com> --------- Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>