Gabriel39 opened a new pull request, #65784:
URL: https://github.com/apache/doris/pull/65784
### What problem does this PR solve?
Issue Number: N/A
Related PR: N/A
Problem Summary: Legacy Iceberg Parquet and ORC files without field IDs are
resolved through name mapping. With a partial mapping, FE omitted the optional
mapping metadata for unmapped fields, so both V1 and V2 BE readers fell back to
the current physical name and read unrelated data.
This change preserves table-level mapping presence by transporting explicit
empty per-field lists and makes those lists authoritative in both readers.
Unmapped fields now materialize their default or NULL, while mapped aliases and
scans without name mapping retain their existing behavior.
### Release note
Fix reads of migrated Iceberg files with partial name mapping so fields
omitted from the mapping materialize their default value or NULL instead of
matching a physical column by the current name.
### Check List (For Author)
- Test: Unit Test
- `ExternalUtilTest` (6 tests)
- Focused V1 and V2 name-mapping BE unit tests under ASAN (10 tests)
- Behavior changed: Yes. Partial Iceberg name mappings are now authoritative
for legacy files without field IDs.
- Does this need documentation: No
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