nealrichardson commented on issue #7385:
URL: https://github.com/apache/arrow/issues/7385#issuecomment-641472127
This appears to be a feature of how `data.matrix()` interacts with
`bit64::integer64` class objects. Here's a reprex without involving `arrow`:
```
> df <- data.frame(a=bit64::as.integer64(1:2), b=bit64::as.integer64(3:4))
> df
a b
1 1 3
2 2 4
> data.matrix(df)
a b
[1,] 4.940656e-324 1.482197e-323
[2,] 9.881313e-324 1.976263e-323
```
You could fix this in your example either by providing a schema in Python
with int32 types, or by calling `as.integer` on the columns of your data.frame
before calling `data.matrix()`.
One could argue that we should downcast int64 to int32 if there are no out
of bounds values since that's what R can natively handle. I made
https://issues.apache.org/jira/browse/ARROW-9083 to consider that.
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