Gabriel39 opened a new pull request, #66345:
URL: https://github.com/apache/doris/pull/66345
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #66007
Problem Summary:
Several review follow-ups from #66007 remained open:
- preserve an explicitly empty Iceberg read across a concurrent first append;
- quote nested DESCRIBE comments as round-trippable SQL literals;
- keep successful strict pre-casts compatible with required struct fields;
- project inherited parent null masks into trivial ARRAY and MAP descendants;
- load the latest connector sink target schema once per bind.
This PR adds the missing state propagation, nullability handling, collection
mask projection, shared SQL literal quoting, and bind-scoped target schema
snapshot.
### Release note
Fix Iceberg MVCC and nested schema-evolution edge cases in connector reads,
writes, DESCRIBE output, casts, and sink binding.
### Check List (For Author)
- Test
- [x] Regression tests
- [x] Unit tests
- Behavior changed:
- [x] Yes. Correctness fixes for the affected edge cases.
- Does this need documentation?
- [x] No.
### Tests
- FE Core targeted tests: 23 passed
- Iceberg Connector targeted tests: 74 passed
- BE ASAN targeted tests: 4 passed
- FE Checkstyle: 0 violations
- `git diff --check`
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