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Posted to jira@arrow.apache.org by "Neal Richardson (Jira)" <ji...@apache.org> on 2021/09/21 13:09:00 UTC
[jira] [Commented] (ARROW-14051) [R] Handle conditionals enclosing
aggregate expressions
[ https://issues.apache.org/jira/browse/ARROW-14051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17418109#comment-17418109 ]
Neal Richardson commented on ARROW-14051:
-----------------------------------------
How does it fail? I would expect that to work (generate 3 temp aggregations, then mutate {{r = ifelse(..temp0 > 1, ..temp1, ..temp2)}} )
> [R] Handle conditionals enclosing aggregate expressions
> -------------------------------------------------------
>
> Key: ARROW-14051
> URL: https://issues.apache.org/jira/browse/ARROW-14051
> Project: Apache Arrow
> Issue Type: Improvement
> Components: R
> Reporter: Ian Cook
> Priority: Major
> Labels: query-engine
>
> This type of {{summarise()}} expression does not work in arrow:
> {code:r}
> Table$create(x = c(0, 1, 1), y = c(2, 3, 5), z = c(8, 13, 21)) %>%
> group_by(x) %>%
> summarise(r = ifelse(n() > 1, mean(y), mean(z))){code}
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