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branch-4.0: [fix](outfile)Preserve DateTimeV2 scale in OUTFILE CSV. #64344 - #64713

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Cherry-picked from #64344

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Thank you for your contribution to Apache Doris.
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run buildall

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BE UT Coverage Report

Increment line coverage 100.00% (1/1) 🎉

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Function Coverage53.33% (19458/36483)
Line Coverage36.45% (181865/498930)
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BE Regression && UT Coverage Report

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@github-actionsgithub-actionsBot added the approved Indicates a PR has been approved by one committer. label Jun 24, 2026
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PR approved by at least one committer and no changes requested.

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PR approved by anyone and no changes requested.

@hubgeter@morrySnow
[fix](outfile)Preserve DateTimeV2 scale in OUTFILE CSV. (#64344)
e5703e4
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
```
@morrySnow
morrySnowforce-pushed the auto-pick-64344-branch-4.0 branch from 0e6edbf to e5703e4CompareAugust 31, 2026 07:06
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