amoeba commented on PR #43634:
URL: https://github.com/apache/arrow/pull/43634#issuecomment-2285135014
Hi @jonkeane, this is great. The only extension I'm personally familiar with
is `units`. Would that make sense to test here? See:
```r
> library(arrow)
> library(units)
> df <- data.frame(x=1:10)
> units(df$x) <- "s"
> df
x
1 1 [s]
2 2 [s]
3 3 [s]
4 4 [s]
5 5 [s]
6 6 [s]
7 7 [s]
8 8 [s]
9 9 [s]
10 10 [s]
> class(df$x)
[1] "units"
> # write.csv/read.csv drops units
> tf <- tempfile()
> write.csv(df, tf)
> read.csv(tf)
X x
1 1 1
2 2 2
3 3 3
4 4 4
5 5 5
6 6 6
7 7 7
8 8 8
9 9 9
10 10 10
> # write_csv_arrow errors
> tf <- tempfile()
> arrow::write_csv_arrow(df, tf)
Error: Invalid: Unsupported Type: [s]
> # write/read_parquet works great
> write_parquet(df, tf)
> read_parquet(tf)
x
1 1 [s]
2 2 [s]
3 3 [s]
4 4 [s]
5 5 [s]
6 6 [s]
7 7 [s]
8 8 [s]
9 9 [s]
10 10 [s]
```
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