xtimbeau opened a new issue #11760:
URL: https://github.com/apache/arrow/issues/11760
I think I don't understand exactly what datasets are suppose to perform.
here is a simple example where I create a sample dataset, hive partionned on
discrete variable `x`
```
test_data <- tibble(x = round(10*runif(1000)), t = runif(1000))
dir.create("test")
write_dataset(test_data |> group_by(x), format="parquet", path="test" )
```
So far, it's fine, but when I perform the following command I get this non
commutative result :
`td |> group_by(x) |> collect() |> summarize(n())
`
counts 1 for each group
whereas
`td |> group_by(x) |> summarize(n()) |> collect() `
counts correctly number of rows.
So why this difference ?
using arrow 6.0.1, R 4.1.2, rstudio 2021.09.0 Build 351 on windows or linux
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