EinMaulwurf commented on issue #45601:
URL: https://github.com/apache/arrow/issues/45601#issuecomment-2908678489
Thanks, this solution fits much better to my workflow! Here's an example of
how I would now use it:
```r
col_kauf <- c(
"kaufpreis", "plz", "baujahr", "wohnflaeche", "zimmeranzahl",
"ajahr", "amonat", "ejahr", "emonat", "ergg_1km", "dupID_gen"
)
open_dataset("data.parquet") %>%
select(all_of(col_kauf)) %>%
mutate(
across(
c("kaufpreis", "baujahr", "wohnflaeche", "zimmeranzahl", "ajahr",
"amonat", "ejahr", "emonat", "dupID_gen"),
~cast(.x, int32())
),
across(
c("plz", "ergg_1km"),
~cast(.x, string())
)
) %>%
write_dataset("data_no_labels.parquet")
open_dataset("data_no_labels.parquet") %>%
filter(kaufpreis >= 1000000, baujahr >= 2000) %>%
group_by(plz) %>%
summarise(
n = n(),
mean = mean(kaufpreis),
median = median(kaufpreis)
) %>%
filter(n > 10) %>%
arrange(desc(mean)) %>%
collect()
```
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