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https://issues.apache.org/jira/browse/ARROW-15904?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alessandro Molina updated ARROW-15904:
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Priority: Major (was: Blocker)
> [C++] Support rolling backwards and forwards with temporal arithmetic
> ---------------------------------------------------------------------
>
> Key: ARROW-15904
> URL: https://issues.apache.org/jira/browse/ARROW-15904
> Project: Apache Arrow
> Issue Type: Sub-task
> Components: C++
> Reporter: Dragoș Moldovan-Grünfeld
> Assignee: Rok Mihevc
> Priority: Major
>
> Original description in ARROW-11090:
> "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.)"
> For example, in R, lubridate has the following functionality:
> * {{rollbackward()}} or {{rollback()}} which changes a date to the last day
> of the previous month or to the first day of the current month
> * {{rollforward()}} which rolls to the last day of the current month or to
> the first day of the next month.
> * all of the above also offer the option to preserve hms (hours, minutes and
> seconds) when rolling.
> This functionality underpins functions such as {{%m-%}} and {{%m+%}} which
> are used to add or subtract months to a date without exceeding the last day
> of the new month.
> {code:r}
> library(lubridate)
> jan <- ymd_hms("2010-01-31 03:04:05")
> jan + months(1:3) # Feb 31 and April 31 returned as NA
> #> [1] NA "2010-03-31 03:04:05 UTC"
> #> [3] NA
> # NA "2010-03-31 03:04:05 UTC" NA
> jan %m+% months(1:3) # No rollover
> #> [1] "2010-02-28 03:04:05 UTC" "2010-03-31 03:04:05 UTC"
> #> [3] "2010-04-30 03:04:05 UTC"
> leap <- ymd("2012-02-29")
> "2012-02-29 UTC"
> #> [1] "2012-02-29 UTC"
> leap %m+% years(1)
> #> [1] "2013-02-28"
> leap %m+% years(-1)
> #> [1] "2011-02-28"
> leap %m-% years(1)
> #> [1] "2011-02-28"
> x <- ymd_hms("2019-01-29 01:02:03")
> add_with_rollback(x, months(1))
> #> [1] "2019-02-28 01:02:03 UTC"
> add_with_rollback(x, months(1), preserve_hms = FALSE)
> #> [1] "2019-02-28 UTC"
> add_with_rollback(x, months(1), roll_to_first = TRUE)
> #> [1] "2019-03-01 01:02:03 UTC"
> add_with_rollback(x, months(1), roll_to_first = TRUE, preserve_hms = FALSE)
> #> [1] "2019-03-01 UTC"
> {code}
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