branch-4.0: [fix](paimon) Fix Paimon time-travel tag reads for expired snapshots #60166 #60222
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…60166) ### What problem does this PR solve? - Related PR: #53327 ## Problem Queries like `FOR VERSION AS OF '<tag>'` fail when the tag points to a snapshot whose snapshot file has expired, even though the tag is still valid and data should be retained by tag. ## Root Cause Doris always translated time-travel requests into `scan.snapshot-id`. Paimon validates snapshot-id against the current snapshot range; once a snapshot file is expired, it is out of range and the query fails. Tag-based reads should use `scan.tag-name` instead, which bypasses that snapshot range validation. ## Fix Use `scan.tag-name` for tag-based time travel (`@tag` and `FOR VERSION AS OF '<tag>'`), and keep `scan.snapshot-id` only for numeric snapshot-id queries. Add regression coverage that: - validates tag reads succeed after snapshot expiration - validates direct snapshot-id reads against expired snapshots still fail
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Thank you for your contribution to Apache Doris. Please clearly describe your PR:
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run buildall |
yiguolei
approved these changes
Jan 26, 2026
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Cherry-picked from #60166