leaves12138 opened a new pull request, #9886:
URL: https://github.com/apache/paimon/pull/9886
### Purpose
Follow up on #9845 with manifest extra-file lifecycle management, extracted
from #9743.
- Delete an unreferenced manifest together with its explicitly recorded
extra files, including custom sidecar names.
- Use the manifest metadata when cleaning newly created manifests after a
failed commit or merge; keep reused manifests intact.
- Include extra files in snapshot/tag/changelog retention sets. Preserve
shared extra files that are still referenced by retained manifests.
- Keep orphan cleanup based on explicit references rather than names
inferred from a manifest suffix.
This change uses the existing `_EXTRA_FILES` field. It does not introduce
new table options, enable sidecar generation, change the file format, or add
scan pruning. Writer and reader integration remain follow-ups.
### Tests
Java 8: 159 tests passed with Checkstyle and Spotless enabled.
Coverage includes metadata round-trips, deletion of only explicitly
referenced files, shared-file retention, failed delta/changelog/merge commit
cleanup, snapshot and tag retention, orphan cleanup, and existing manifest
rewrite failures.
```sh
mvn -B -ntp -nsu -pl paimon-codegen-loader -am -DskipTests package
mvn -B -ntp -nsu -pl paimon-core -am -DwildcardSuites=none
-DfailIfNoTests=false -Dflink.forkCount=2 \
-Dtest=ManifestSidecarLifecycleTest,ManifestFileTest,ManifestFileMetaSerializerTest,ManifestRewriteCleanupTest,ExpireSnapshotsTest,LocalOrphanFilesCleanTest
test
```
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