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https://issues.apache.org/jira/browse/ARROW-13543?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17405892#comment-17405892
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Ian Cook edited comment on ARROW-13543 at 8/27/21, 3:59 PM:
------------------------------------------------------------
ARROW-13737 enables grouped aggregation on scalar columns, but that is
different from this.
was (Author: icook):
ARROW-13737 enables grouped aggregation on scalar columns.
> [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
> Priority: Major
> Labels: query-engine
> Fix For: 6.0.0
>
>
> 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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