hubgeter opened a new pull request, #67323:
URL: https://github.com/apache/doris/pull/67323
### What problem does this PR solve?
Related PR: #66538
Problem Summary:
Iceberg V3 requires both `initial-default` and `write-default` of a VARIANT
field to be NULL. After adding general Iceberg V3 default-value support, Doris
still needs explicit VARIANT handling to avoid accepting unsupported non-NULL
defaults or reconstructing a compute-V2 VARIANT as the legacy type.
This PR:
- Rejects non-NULL VARIANT `initial-default` and `write-default` values in
FE.
- Adds the same validation to the BE read path for malformed or externally
forged Iceberg metadata.
- Preserves the compute-V2 VARIANT type when reconstructing the current
schema from Thrift metadata.
- Supports typed SQL NULL defaults for optional VARIANT fields, including
VARIANT fields nested inside structs.
- Adds FE and BE unit coverage.
- Adds an external Iceberg regression covering historical Parquet/ORC rows,
INSERT, UPDATE, MERGE, explicit `DEFAULT`, SQL NULL versus JSON null, invalid
DDL, and Spark interoperability.
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [ ] 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.
- [ ] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [ ] No.
- [ ] 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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