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ARROW-13543: [R] Handle summarize() with 0 arguments or no aggregate functions #11078

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ARROW-13543: [R] Handle summarize() with 0 arguments or no aggregate functions #11078

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2 changes: 1 addition & 1 deletion r/R/dplyr-summarize.R
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Original file line number Diff line number Diff line change
Expand Up @@ -51,7 +51,7 @@ do_arrow_summarize <- function(.data, ..., .groups = NULL) {

mask <- arrow_mask(.data, aggregation = TRUE)

results <- list()
results <- empty_named_list()
for (i in seq_along(exprs)) {
# Iterate over the indices and not the names because names may be repeated
# (which overwrites the previous name)
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10 changes: 10 additions & 0 deletions r/tests/testthat/test-dplyr-summarize.R
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Expand Up @@ -369,3 +369,13 @@ test_that("Expressions on aggregations", {
tbl
)
})

test_that("Summarize with 0 arguments", {
expect_dplyr_equal(
input %>%
group_by(some_grouping) %>%
summarize() %>%
collect(),
tbl
)
})