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https://issues.apache.org/jira/browse/ARROW-13549?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Li updated ARROW-13549:
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Description:
Change casting from timestamp to date/time to extract the value, instead of
just truncating as we currently do (which rounds, giving incorrect answers, in
some cases). This should also be a safe cast by default (unless you want to do
something like cast from timestamp[ns] to time32[s] which may overflow).
This should behave like Postgres DATE/CAST(... as TIME), or Pandas
Timestamp.date/Timestamp.time.
was:
Add a kernel that can extract just the date or the time from a timestamp.
This should behave like Postgres DATE/CAST(... as TIME), or Pandas
Timestamp.date/Timestamp.time.
Extracting the date appears to be doable with an unsafe cast, but it might be
more convenient to have an explicit kernel (and an unsafe cast, at least in the
Python bindings, disables all checks, not just the check we care about).
> [C++] Implement timestamp to date/time cast that extracts value
> ---
>
> Key: ARROW-13549
> URL: https://issues.apache.org/jira/browse/ARROW-13549
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
>Reporter: David Li
>Assignee: David Li
>Priority: Major
> Labels: kernel, pull-request-available
> Fix For: 6.0.0
>
> Time Spent: 3h 50m
> Remaining Estimate: 0h
>
> Change casting from timestamp to date/time to extract the value, instead of
> just truncating as we currently do (which rounds, giving incorrect answers,
> in some cases). This should also be a safe cast by default (unless you want
> to do something like cast from timestamp[ns] to time32[s] which may overflow).
> This should behave like Postgres DATE/CAST(... as TIME), or Pandas
> Timestamp.date/Timestamp.time.
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