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https://issues.apache.org/jira/browse/ARROW-12031?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Antoine Pitrou reassigned ARROW-12031:
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Assignee: Martin Nowak
> [C++][CSV] infer CSV timestamps columns with fractional seconds
> ---------------------------------------------------------------
>
> Key: ARROW-12031
> URL: https://issues.apache.org/jira/browse/ARROW-12031
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Affects Versions: 3.0.0
> Reporter: Martin Nowak
> Assignee: Martin Nowak
> Priority: Trivial
> Labels: pull-request-available
> Fix For: 4.0.0
>
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> After implementing fractional second parsing in and ARROW-9107 and
> ARROW-10337, no support for inference of subsecond timestamps was added (see
> [code]([https://github.com/apache/arrow/blob/master/cpp/src/arrow/csv/inference_internal.h#L115),
> also mentioned in ARROW-3738).
> The [InferState logic |
> https://github.com/apache/arrow/blob/81d6724546559fa8d6e85376a1cc339dab0506ad/cpp/src/arrow/csv/inference_internal.h#L63]
> could test for TimestampNS (with nanosecond resolution) after Timestamps
> with second resolution to not change existing inference results.
> Wouldn't expect too much interest in trying to infer timestamps with milli-
> and microsecond resolution. The nanosecond resolution [can already parse
> |https://github.com/apache/arrow/blob/81d6724546559fa8d6e85376a1cc339dab0506ad/cpp/src/arrow/util/value_parsing.h#L512-L518]
> the lower resolution ones.
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