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Posted to github@arrow.apache.org by "JosiahParry (via GitHub)" <gi...@apache.org> on 2023/11/23 02:27:47 UTC
[I] `ffi::from_ffi()` requires a schema for an array [arrow-rs]
JosiahParry opened a new issue, #5118:
URL: https://github.com/apache/arrow-rs/issues/5118
**Which part is this question about**
`ffi::from_ffi()`
**Describe your question**
When using `ffi::from_ffi()` to bring in an array from R, we need have a reference to `FFI_ArrowSchema` however, the arrays in R do not have a schema associated with it. Is there another way to bring an array _without_ a schema or provide an empty one?
**Additional context**
Related: https://github.com/JosiahParry/arrow-extendr/issues/1
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Re: [I] `ffi::from_ffi()` requires a schema for an array [arrow-rs]
Posted by "wjones127 (via GitHub)" <gi...@apache.org>.
wjones127 commented on issue #5118:
URL: https://github.com/apache/arrow-rs/issues/5118#issuecomment-1830507243
@JosiahParry Can we close this?
> arrays in R do not have a schema associated with it.
To fill in some blanks for future readers. Arrays don't have a "schema" but they do have a data type (e.g. float, double, int64), and that's what information needs to be set in `FFI_ArrowSchema`.
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Re: [I] `ffi::from_ffi()` requires a schema for an array [arrow-rs]
Posted by "viirya (via GitHub)" <gi...@apache.org>.
viirya commented on issue #5118:
URL: https://github.com/apache/arrow-rs/issues/5118#issuecomment-1823762702
Hmm, without a schema, how does the importer knows what are the arrays to be imported and how to interpret the contents? When you export the arrays from R, you should export both ArrowSchema and ArrowArray structs: https://arrow.apache.org/docs/format/CDataInterface.html.
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Re: [I] `ffi::from_ffi()` requires a schema for an array [arrow-rs]
Posted by "JosiahParry (via GitHub)" <gi...@apache.org>.
JosiahParry closed issue #5118: `ffi::from_ffi()` requires a schema for an array
URL: https://github.com/apache/arrow-rs/issues/5118
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Re: [I] `ffi::from_ffi()` requires a schema for an array [arrow-rs]
Posted by "JosiahParry (via GitHub)" <gi...@apache.org>.
JosiahParry commented on issue #5118:
URL: https://github.com/apache/arrow-rs/issues/5118#issuecomment-1830521971
@wjones127 thank you for the additional context. I think that is what was missing for me.
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