[jira] [Commented] (ARROW-17839) [Python] Cannot create RecordBatch with nested struct containing extension type

["Matthias Vallentin (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-17839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17611823#comment-17611823 ] 

Matthias Vallentin commented on ARROW-17839:
--------------------------------------------

Thanks for the guidance, Joris!

Regarding the dictionary, nowhere in the code I use {{{}int8{}}}. Where do I implicitly "commit" to {{int8 }}without knowing it?

> [Python] Cannot create RecordBatch with nested struct containing extension type
> -------------------------------------------------------------------------------
>
>                 Key: ARROW-17839
>                 URL: https://issues.apache.org/jira/browse/ARROW-17839
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Python
>    Affects Versions: 9.0.0
>         Environment: macOS 12.5.1 on an Apple M1 Ultra.
>            Reporter: Matthias Vallentin
>            Priority: Blocker
>         Attachments: enum.py, example.py
>
>
> I'm running into the following issue:
> {code:java}
> pyarrow.lib.ArrowNotImplementedError: Unsupported cast to extension<vast.address<AddressType>> from fixed_size_binary[16]{code}
> Use case: I want to create a record batch that contains this type:
> {code:java}
> pa.struct([("address", AddressType()), ("length", pa.uint8())]){code}
> Here, {{AddressType}} is an extension type that models an IP address ({{{}pa.binary(16){}}}).
> Please find attached a self-contained example that illustrates the issue.
>  



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