SHIMA Tatsuya created ARROW-17424:
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Summary: [R] Microseconds are not sufficient units 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
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?
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