[jira] [Closed] (ARROW-11702) [R] Enable ungrouped aggregations in non-Dataset expressions

["Neal Richardson (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-11702?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Neal Richardson closed ARROW-11702.
-----------------------------------
    Resolution: Invalid

We'll solve this differently once we can do joins.

> [R] Enable ungrouped aggregations in non-Dataset expressions
> ------------------------------------------------------------
>
>                 Key: ARROW-11702
>                 URL: https://issues.apache.org/jira/browse/ARROW-11702
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: R
>            Reporter: Neal Richardson
>            Priority: Major
>
> Things like {{mutate(table, x_norm = x / mean(x, na.rm = TRUE))}} could be supported for queries on Table/RecordBatch (but not yet on Dataset), but even so there are lots of gotchas, such as order of evaluation when building up a lazy query (i.e. evaluating aggregation before or after a filter expression that may change the value of the aggregation result).



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