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https://issues.apache.org/jira/browse/ARROW-8257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17070445#comment-17070445
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Wes McKinney commented on ARROW-8257:
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Would you mind sending this to d...@arrow.apache.org instead? Thank you
> Clarification regarding the `CDataInterface.rst`
> ------------------------------------------------
>
> Key: ARROW-8257
> URL: https://issues.apache.org/jira/browse/ARROW-8257
> Project: Apache Arrow
> Issue Type: Bug
> Reporter: Anish Biswas
> Priority: Major
>
> I have been trying to wrap my head around the[
> CDataInterface.rst|[https://github.com/apache/arrow/blob/master/docs/source/format/CDataInterface.rst]]
> document for a few days now. So what I am trying is basically to use the C
> interface with a minimum dependencies to produce blocks of bytes that pyarrow
> can reconstruct and work on as a normal pyarrow array (and vice-versa: both
> directions).
> Here's what I already tried doing.
> * Created a C library that contains the two structs ArrowSchema and
> ArrowArray and some functions to export an int64_t array as an Arrow Array.
> This is very similar to what the document did with int32_t arrays.
> * Imported the C library in Python. Created an int64_t pyarrow.array.
> Serialized it to read the bytes via Numpy and populated the C struct I
> created using the C library function.
> What I expected was that the bytes would have some resemblance to each other
> and that pyarrow would have some utility to pick up the ArrowArray struct and
> treat it as an Arrow Array. But I couldn't get it to work.
> I am also confused as to how do I use ArrowSchema properly. The
> {{ArrowSchema}} is the only structure that differentiates different
> {{ArrowArray}} formats. However, the fact that I am not using it anywhere
> with the {{ArrowArray}} struct or for that matter for any kind of
> initialization which tells the Arrow library that "The next structure you
> will encounter would be of the kind that the {{ArrowSchema}} has provided
> you", doesn't seem correct to me.
> It would really help me out, if you could tell if I actually misinterpreted
> the doc, or am I doing something wrong. Thanks!
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