Mryange opened a new pull request, #63290:
URL: https://github.com/apache/doris/pull/63290
### What problem does this PR solve?
Issue Number: N/A
Problem Summary:
Schema change could fail when adding a TIMESTAMPTZ column with DEFAULT
CURRENT_TIMESTAMP, such as ALTER TABLE ... ADD COLUMN ts TIMESTAMPTZ(6) DEFAULT
CURRENT_TIMESTAMP(6). Existing rows are backfilled from Column.realDefaultValue
during schema change, but FE previously materialized CURRENT_TIMESTAMP as a
plain datetime string without a timezone offset. Root cause: the schema-change
default serialization path was not type-aware for TIMESTAMPTZ, while BE expects
a TIMESTAMPTZ literal with an offset when parsing the backfill value. This
change makes both the Nereids and legacy ColumnDef paths materialize
TIMESTAMPTZ CURRENT_TIMESTAMP defaults with the session offset, reuses
TimestampTzLiteral formatting for the datetime body, and adds FE and regression
coverage for the schema-change path.
### 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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