jacktengg opened a new pull request, #67493:
URL: https://github.com/apache/doris/pull/67493
### What problem does this PR solve?
Issue Number: None
Related PR: None
Problem Summary: CONVERT_TZ mapped nonexistent local times in
daylight-saving gaps to the transition instant while explicitly discarding the
DateTimeV2 fractional component. This made BE execution inconsistent with
timezone-bearing casts, and FE constant folding had the same precision loss.
Preserve and round the fractional component consistently in BE and FE. Because
preserving fractions introduces resets at civil-second boundaries inside a gap,
also disable the monotonic partition-pruning shortcut for affected
positive-scale ranges.
### Release note
CONVERT_TZ now preserves DateTimeV2 fractional seconds when a source local
time falls in a daylight-saving gap.
### Check List (For Author)
- Test: Unit Test and Regression test
- BE unit test: VTimestampFunctionsTest.convert_tz_test
- FE unit tests: DateTimeExtractAndTransformTest, ConvertTzTest
- Regression test:
query_p0/sql_functions/datetime_functions/test_convert_tz
- Behavior changed: Yes. CONVERT_TZ preserves fractional seconds in DST gaps.
- Does this need documentation: No
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
### 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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