Neal Richardson created ARROW-11702:
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Summary: [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
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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