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https://issues.apache.org/jira/browse/ARROW-11090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17503922#comment-17503922
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Rok Mihevc commented on ARROW-11090:
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Oh sorry, I missed that.
I'm unfamiliar with rollback. Would you say
[this|https://github.com/tidyverse/lubridate/blob/main/tests/testthat/test-rollback.R]
is a complete test of the feature? Could it be accomplished with subtract and
floor/ceil (where floor/ceil would be adjusted to have change_on_boundary
option)?
I would still propose opening a new ticket to discuss and track the work there
and to give it visibility.
> [C++] Support temporal arithmetic ({time,date}{32,64}, timestamp, interval)
> ---------------------------------------------------------------------------
>
> Key: ARROW-11090
> URL: https://issues.apache.org/jira/browse/ARROW-11090
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Jonathan Keane
> Priority: Major
> Labels: kernel
> Fix For: 8.0.0
>
>
> [It appears that only subtract on two timestamps is currently
> supported|https://github.com/apache/arrow/commit/dd94a5809b56b32fe2fb538f688bf568d9642e3b]
> when there is more supported, we should include support for that in R.
>
> This should also cover the ability to do with and without rollback (so have
> the ability to do e.g. 2021-03-30 minus 1 month and either get a null back,
> or 2021-02-28), plus the ability to specify whether to rollback to the first
> or last, and whether to preserve or rest the time.)
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