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https://issues.apache.org/jira/browse/ARROW-14362?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17430661#comment-17430661
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Neal Richardson commented on ARROW-14362:
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Sure, sounds like something to mention in ARROW-12137.
Note that {{arrow::case_when}} does not exist.
> [R] Should case_when() work outside mutate()
> --------------------------------------------
>
> Key: ARROW-14362
> URL: https://issues.apache.org/jira/browse/ARROW-14362
> Project: Apache Arrow
> Issue Type: Improvement
> Components: R
> Reporter: Dragoș Moldovan-Grünfeld
> Priority: Minor
>
> Currently {{arrow::case_when()}} has been implemented to work inside an
> {{arrow::mutate()}} call. As a consequence, this chunk of code errors:
> {code:r}
> arrow_vec <- Array$create(c(1:3, 5:8))
> case_when(arrow_vec < 4 ~ "less than 4",
> TRUE ~ "greater than 4")
> Error: LHS of case 1 (`arrow_vec < 4`) must be a logical vector, not a
> `Array/ArrowDatum/ArrowObject/R6` object.
> {code}
> while the equivalent dplyr code works:
> {code:r}
> library(dplyr)
> num_vec <- c(1:3, 5:8)
> case_when(
> num_vec < 4 ~ "less than 4",
> TRUE ~ "greater than 4")
> [1] "less than 4" "less than 4" "less than 4" "greater than 4"
> [5] "greater than 4" "greater than 4" "greater than 4"
> {code}
> This is related to ARROW-13799.
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