nealrichardson commented on code in PR #33917:
URL: https://github.com/apache/arrow/pull/33917#discussion_r1096360910
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r/R/query-engine.R:
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@@ -101,7 +101,11 @@ ExecPlan <- R6Class("ExecPlan",
# plus group_by_vars (last)
# TODO: validate that none of names(aggregations) are the same as
names(group_by_vars)
# dplyr does not error on this but the result it gives isn't great
- node <- node$Project(summarize_projection(.data))
+ projection <- summarize_projection(.data)
+ # skip projection if no grouping and all aggregate functions are
nullary
Review Comment:
Would something be harmed if it were projected to having 0 columns? Would
that be even more efficient?
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