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Posted to jira@arrow.apache.org by "Neal Richardson (Jira)" <ji...@apache.org> on 2021/02/19 21:46:00 UTC

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

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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