[
https://issues.apache.org/jira/browse/ARROW-17424?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
SHIMA Tatsuya updated ARROW-17424:
----------------------------------
Summary: [R] Microsecond is not sufficient unit for POSIXct (was: [R]
Microsecond is not sufficient units for POSIXct)
> [R] Microsecond is not sufficient unit for POSIXct
> --------------------------------------------------
>
> Key: ARROW-17424
> URL: https://issues.apache.org/jira/browse/ARROW-17424
> Project: Apache Arrow
> Issue Type: Improvement
> Components: R
> Affects Versions: 9.0.0
> Reporter: SHIMA Tatsuya
> Priority: Major
>
> I believe the {{POSIXct}} type or R currently corresponds to the Arrow
> {{timestamp[us, tz=UTC]}} type.
> {code:r}
> lubridate::as_datetime(0) |> arrow::infer_type()
> #> Timestamp
> #> timestamp[us, tz=UTC]
> {code}
> However, as shown below, POSIXct may hold data finer than a microsecond.
> {code:r}
> lubridate::as_datetime(0.000000001) |> as.numeric()
> #> [1] 1e-09
> lubridate::as_datetime("1970-01-01 00:00:00.0000001") |> as.numeric()
> #> [1] 1.192093e-07
> {code}
> I don't know why it is currently set in microseconds, but is there any reason
> not to set it in nanoseconds?
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
