Re: [I] [R] Initializing an Arrow array from an R difftime or hms::hms rounds down to the nearest time unit [arrow]

["eitsupi (via GitHub)" <gi...@apache.org>]

eitsupi commented on issue #40109:
URL: https://github.com/apache/arrow/issues/40109#issuecomment-2439259789

   > The default should be to convert to nanoseconds, like `arrow::as_arrow_array(type = arrow::duration("ns"))`. 2^64 ns is ~585 years, so you don't generally have to worry about overflow.
   
   In fact, since the difftime class object is based on a double vector, isn't the period that can be represented exactly up to 2^53-1 as described here? https://github.com/apache/arrow/issues/32693#issuecomment-1846140077
   
   I have recently rewritten the polars package and have restricted POSIXct and difftime resolution to millisecond to support more than sufficient range.
   https://github.com/pola-rs/r-polars/blob/1f7cd37637a98f2c6a6f88ed27c608118ffaf939/R/as_polars_series.R#L28-L37
   
   If we need full nanosecond resolution, I think we will need to use the `clock` package.


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