JunRuiLee opened a new pull request, #7940:
URL: https://github.com/apache/paimon/pull/7940
### Purpose
Add metadata repair capability to pypaimon's filesystem catalog. The
repair operation verifies the consistency chain (LATEST → snapshot → manifest
list → manifest → data files) and can optionally fix a dangling LATEST file by
rewriting it to
the newest fully-valid snapshot.
Key behaviors:
- Branch-qualified identifiers (`db.table$branch_name`) repair the correct
branch
- `check_data_files=True` verifies data file existence using proper
partition path construction, respects custom `partition.default-name`, and
skips DELETE entries
- Fix mode only selects a snapshot whose entire manifest chain (and
optionally data files) passes validation
### Tests
21 unit tests in `pypaimon/tests/repair_test.py`
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