hubgeter opened a new pull request, #65851:
URL: https://github.com/apache/doris/pull/65851
### What problem does this PR solve?
Related PR: #65329
Problem Summary:
Iceberg V3 distinguishes initial defaults used to read older files from
write defaults used for new writes. Doris previously returned NULL for fields
that were absent from a data file and did not propagate nested field defaults.
This change carries Iceberg initial-default metadata through FE and Thrift,
materializes missing primitive and complex values independently in File Scanner
V1 and V2, preserves physical value and NULL precedence, and adds Spark-Iceberg
generated coverage without expanding Doris Iceberg type mappings.
### Release note
Support reading Iceberg V3 initial defaults for missing primitive and nested
fields in File Scanner V1 and V2.
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [x] Regression test
- [x] Unit Test
- [ ] Manual test (add detailed scripts or steps below)
- [ ] No need to test or manual test. Explain why:
- [ ] This is a refactor/code format and no logic has been changed.
- [ ] Previous test can cover this change.
- [ ] No code files have been changed.
- [ ] Other reason <!-- Add your reason? -->
- Behavior changed:
- [ ] No.
- [x] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [ ] No.
- [x] Yes. <!-- Add document PR link here. eg:
https://github.com/apache/doris-website/pull/1214 -->
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label <!-- Add branch pick label that this PR should
merge into -->
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