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https://issues.apache.org/jira/browse/ARROW-18242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17629025#comment-17629025
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Nicola Crane commented on ARROW-18242:
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I can't test this example as I don't have a Windows machine available to me
now, but I'm guessing we get the same problem using this tiny reprex:
{{arrow_table(x = '00001976') %>% mutate(y = ymd(x)) %>% collect()}}
> [R] arrow implementation of lubridate::dmy parses invalid date "00001976" as
> date
> ---------------------------------------------------------------------------------
>
> Key: ARROW-18242
> URL: https://issues.apache.org/jira/browse/ARROW-18242
> Project: Apache Arrow
> Issue Type: Bug
> Components: R
> Reporter: Lucas Mation
> Priority: Critical
>
> Sorry for so many issues, but I think this is another bug.
> Wrong behavior of the arrow implementation of the `lubridate::dmy`.
> An invalid date such as '00001976' is being parsed as a valid (and completely
> unrelated) date.
> #in R
> '00001976' %>% dmy
> [1] NA
> Warning message:
> All formats failed to parse. No formats found.
> #In arrow
> q <- data.table(x=c('00001976','30111976','01011976'))
> q %>% write_dataset('q')
> q2 <- 'q' %>% open_dataset %>% mutate(x2=dmy) %>% collect
> q2
> x
> 1: 1975-11-30
> 2: 1976-11-30
> 3: 1976-01-01
> #notice '00001976' is an invalid date. First row of x2 should be NA!!!
>
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