Gabriel39 opened a new pull request, #66600:
URL: https://github.com/apache/doris/pull/66600
### What problem does this PR solve?
This is the branch-4.0 backport of #66599.
An external table can have incomplete owner references after metadata
recovery. When materialized-view rewrite is enabled, `CollectRelation`
constructs a `BaseTableInfo` from that table and aborts the entire query
because the database is null.
The backport restores the catalog and database references before publishing
a registered external table. It also skips optional MTMV candidate collection
when an already-cached table still has incomplete owner metadata.
Related issue: #58441
### Test
- Added unit coverage for owner-reference restoration and safe MTMV
candidate collection.
- Ran `ExternalEqualsTest` and `CollectRelationTest`: 3 tests passed, 0
failures.
- FE Checkstyle passed as part of the FE unit-test build.
### Release note
None.
### Check List (For Author)
- Test
- [x] Unit Test
- Behavior changed
- [x] No.
- Does this need documentation?
- [x] No.
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