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https://issues.apache.org/jira/browse/ARROW-13543?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Neal Richardson resolved ARROW-13543.
-------------------------------------
Resolution: Fixed
Issue resolved by pull request 11078
[https://github.com/apache/arrow/pull/11078]
> [R] Handle summarize() with 0 arguments or no aggregate functions
> -----------------------------------------------------------------
>
> Key: ARROW-13543
> URL: https://issues.apache.org/jira/browse/ARROW-13543
> Project: Apache Arrow
> Issue Type: Bug
> Components: R
> Reporter: Ian Cook
> Assignee: Neal Richardson
> Priority: Major
> Labels: pull-request-available, query-engine
> Fix For: 6.0.0
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Following ARROW-13344, we should handle the case in which the user calls
> {{summarise()}} but does not call any aggregate functions in it.
> Currently this is unhandled and results in errors (which are then are
> converted to warnings) like:
> {code:java}
> Warning: Error in x[c("fun", "options")] : object of type 'environment' is
> not subsettable ; pulling data into R{code}
> or when the expression in {{summarise()}} has only scalar literals:
> {code:java}
> Warning: Error : $ operator is invalid for atomic vectors
> ; pulling data into R {code}
> or when there are zero arguments passed to {{summarise()}} and there is no
> {{group_by()}} preceding it:
> {code:java}
> Warning: Error : Invalid input type, expected 'character' actual 'NULL'
> ; pulling data into R {code}
> We should aim for consistency with {{dplyr::summarise()}} in these cases, but
> if that's not practical then we should detect this case and throw a more
> informative error.
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