amoeba commented on PR #45346:
URL: https://github.com/apache/arrow/pull/45346#issuecomment-2613382214
You're both right about the behavior. The `.internal.selfref` attribute is
removed and data.table self-heals like @jonkeane said,
```r
> library(data.table)
> dt_in <- data.table(x = 1:10)
> attributes(dt_in)
$names
[1] "x"
$row.names
[1] 1 2 3 4 5 6 7 8 9 10
$class
[1] "data.table" "data.frame"
$.internal.selfref
<pointer: 0x13b821ae0>
> arrow::write_parquet(dt_in, "test.parquet")
> dt_out <- read_parquet("test.parquet")
> attributes(dt_out)
$names
[1] "x"
$row.names
[1] 1 2 3 4 5 6 7 8 9 10
$class
[1] "data.table" "data.frame"
> setDT(dt_out)
> attributes(dt_out)
$names
[1] "x"
$row.names
[1] 1 2 3 4 5 6 7 8 9 10
$class
[1] "data.table" "data.frame"
$.internal.selfref
<pointer: 0x13b821ae0>
```
It doesn't make sense to me how the `.internal.selfref` pointer is the same
on both sides though.
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