jacktengg opened a new pull request, #67334:
URL: https://github.com/apache/doris/pull/67334
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
Schema change evaluates dynamic column defaults once to obtain a fixed
literal for historical-row backfill. FE previously sent only that literal to
BE, so a partial update inserting a new key reused the schema-change timestamp
instead of evaluating CURRENT_TIMESTAMP at statement time. Preserve the
original default expression alongside the fixed backfill literal, persist both
in tablet schema metadata, and use the expression only when partial update
fills missing columns for a new row.
### Release note
Fix partial updates to evaluate dynamic defaults at statement time after
columns are added through schema change.
### 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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