roryqi opened a new pull request, #12533:
URL: https://github.com/apache/gravitino/pull/12533
### What changes were proposed in this pull request?
- Add `GroupOwnerRelPO` for mapping group owners with their metadata object
IDs.
- Add batch group-owner queries to the owner mapper and SQL provider.
- Return both user and group owners from `OwnerMetaService#batchGetOwner`.
- Add tests for group-only and mixed user/group ownership.
### Why are the changes needed?
The batch owner lookup currently omits group-owned metadata objects, while
the single-object owner lookup supports both user and group owners. This causes
incomplete owner results for batch callers.
Fix: #12532
### Does this PR introduce _any_ user-facing change?
Yes. Batch owner lookup now returns group owners in addition to user owners.
No public API signature is changed.
### How was this patch tested?
```shell
./gradlew :core:spotlessApply :core:test \
--tests
org.apache.gravitino.storage.relational.service.TestOwnerMetaService \
-PskipITs -PskipDockerTests=false
```
All 39 tests passed on H2, MySQL, and PostgreSQL.
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