Gabriel39 opened a new pull request, #67574:
URL: https://github.com/apache/doris/pull/67574
### What problem does this PR solve?
Issue Number: N/A
Related PR: N/A
Problem Summary:
Iceberg V2 scans could retain a stale nested file projection after a
predicate on a missing child was demoted, shifting projected sibling values by
physical ordinal. Separately, ID-less migrated files fell back to current-name
mapping after the explicit default name mapping was removed, exposing stale
physical values instead of NULL.
This PR reapplies the finalized scan projection to column mappings and
requires authoritative name mapping for V2 ID-less file reads.
### Release note
Fix Iceberg V2 reads when a rejected nested predicate widens projection and
when migrated ID-less files lose their default name mapping.
### Check List (For Author)
- Test: Unit Test and Regression test
- 24 focused V2 column-mapping and real Parquet reader unit tests passed.
- Iceberg external-table struct schema evolution regression passed.
- ASAN BE build and FE build passed.
- Build hygiene and formatting checks passed.
- Behavior changed: Yes. Iceberg V2 nested projections preserve field-ID
alignment, and migrated ID-less fields without default name mapping materialize
as NULL.
- Does this need documentation: No
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