JunRuiLee opened a new pull request, #7941:
URL: https://github.com/apache/paimon/pull/7941
### Purpose
Add `rollback_to_timestamp` to `FileStoreTable`, allowing users to
rollback a table to the latest snapshot with commit time <= a given timestamp
in milliseconds.
**Note:** The timestamp lookup (`earlier_or_equal_time_mills`) uses a
binary search that breaks on exact match. If multiple snapshots share the same
millisecond, it may not return the highest matching snapshot ID. This matches
Java's
`earlierOrEqualTimeMills` behavior — a coordinated fix across both
languages is a follow-up.
### Tests
- `test_table_rollback_to_timestamp` — writes 5 commits, rolls back using
snapshot 3's timestamp, verifies snapshots 4 and 5 are removed.
- `test_table_rollback_to_timestamp_no_match` — verifies `ValueError` is
raised when timestamp is before the earliest snapshot.
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