ArnavBalyan opened a new pull request, #8748:
URL: https://github.com/apache/paimon/pull/8748
### Purpose
- Tag is meant to be permanent and outlive expired snapshots, even when the
snapshot has expired.
- However when a branch is attempted from a tag, whose underlying snapshot
expired, it fails with FNF.
- This is because create snapshot uses the main snapshot file for copying
instead of the tag file. (Snapshot file is gone but tag file remains)
- For expired snapshot, write the branch from tag instead of copying a
deleted file, similar to the RollbackHelper createSnapshotFileIfNeeded.
### Tests
- UT
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