Dragoș Moldovan-Grünfeld created ARROW-15862:
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Summary: [R][C++] Provide a way to go from integer to duration
Key: ARROW-15862
URL: https://issues.apache.org/jira/browse/ARROW-15862
Project: Apache Arrow
Issue Type: Improvement
Components: C++, R
Reporter: Dragoș Moldovan-Grünfeld
Currently it is not possible to directly create a duration object from a
numeric one (for example through casting).
{code:r}
library(arrow)
a <- Array$create(32L)
a$cast(duration("s"))
#> Error: NotImplemented: Unsupported cast from int32 to duration using
function cast_duration
#> /Users/dragos/Documents/arrow/cpp/src/arrow/compute/function.cc:231
DispatchBest(&inputs)
{code}
This underpins a lot of the date-time arithmetic in R, which support the
conversion/ coercion of an integer to difftime (R's equivalent for duration),
such as in the pipeline below.
{code:r}
library(arrow, warn.conflicts = FALSE)
#> See arrow_info() for available features
library(dplyr, warn.conflicts = FALSE)
library(lubridate, warn.conflicts = FALSE)
df <- tibble(time = as_datetime(c("2022-03-07 15:00:28", "2022-03-06
14:00:28")))
df
#> # A tibble: 2 × 1
#> time
#> <dttm>
#> 1 2022-03-07 15:00:28
#> 2 2022-03-06 14:00:28
df %>%
mutate(time2 = time + seconds(2))
#> # A tibble: 2 × 2
#> time time2
#> <dttm> <dttm>
#> 1 2022-03-07 15:00:28 2022-03-07 15:00:30
#> 2 2022-03-06 14:00:28 2022-03-06 14:00:30
{code}
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