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https://issues.apache.org/jira/browse/ARROW-16627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17543671#comment-17543671
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Antoine Pitrou commented on ARROW-16627:
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This is a bug more than a feature.
> [C++] Support parsing of "2020-01" into `2020-01-01`
> ----------------------------------------------------
>
> Key: ARROW-16627
> URL: https://issues.apache.org/jira/browse/ARROW-16627
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++, R
> Affects Versions: 8.0.0
> Reporter: Dragoș Moldovan-Grünfeld
> Priority: Major
>
> Originated as part of the
> [review|https://github.com/apache/arrow/pull/13196#discussion_r878229869] for
> the ARROW-16407 [PR|https://github.com/apache/arrow/pull/13196].
> Currently we get a surprising output when parsing of {{%Y-%m}} strings such
> as {{"2020-01"}} - see reprex below.
> {code:r}
> library(arrow, warn.conflicts = FALSE)
> call_function(
> "strptime",
> Array$create("2020-01"),
> options = list(
> format = "%Y-%m",
> unit = 0L
> )
> )
> #> Array
> #> <timestamp[s]>
> #> [
> #> 2019-12-31 00:00:00
> #> ]
> {code}
> I'm not sure if this would be useful somewhere else, but we could definitely
> use this to remove some workarounds in the R bindings.
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