hubgeter opened a new pull request, #64344:
URL: https://github.com/apache/doris/pull/64344
### What problem does this PR solve?
Problem Summary:
CSV OUTFILE serialization for DateTimeV2 was using the value-level default
formatter, which emits six fractional digits whenever microseconds are present.
The serializer already carries the declared DateTimeV2 scale, so pass it
through and cover the local OUTFILE CSV path with a focused Groovy regression.
example :
```
table:
CREATE TABLE test_outfile_datetimev2 (
id INT,
dt3 DATETIMEV2(3) ) ...
data :
1 2026-06-06 15:54:51.442
before outfile :
2026-06-06 15:54:51.442000
after outfile:
2026-06-06 15:54:51.442
```
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [x] 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.
- [x] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [x] 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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