branch-4.1: [fix](outfile)Preserve DateTimeV2 scale in OUTFILE CSV. #64344#64714
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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
```
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yiguolei
approved these changes
Jun 23, 2026
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Cherry-picked from #64344