[jira] [Resolved] (ARROW-18423) [Python] Expose reading a schema from an IPC message

["Antoine Pitrou (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-18423?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Antoine Pitrou resolved ARROW-18423.
------------------------------------
    Fix Version/s: 11.0.0
       Resolution: Fixed

Issue resolved by pull request 14831
https://github.com/apache/arrow/pull/14831

> [Python] Expose reading a schema from an IPC message
> ----------------------------------------------------
>
>                 Key: ARROW-18423
>                 URL: https://issues.apache.org/jira/browse/ARROW-18423
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Python
>            Reporter: Andre Kohn
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 11.0.0
>
>          Time Spent: 50m
>  Remaining Estimate: 0h
>
> Pyarrow currently does not implement the reading of an Arrow schema from an IPC message.
> [https://github.com/apache/arrow/blob/80b389efe902af376a85a8b3740e0dbdc5f80900/python/pyarrow/ipc.pxi#L1094]
>  
> We'd like to consume an Arrow IPC stream like the following:
>  
> {code:java}
> schema_msg = pyarrow.ipc.read_message(result_iter.next().data)
> schema = pyarrow.ipc.read_schema(schema_msg)
> for batch_data in result_iter:
>     batch_msg = pyarrow.ipc.read_message(batch_data.data)
>     batch = pyarrow.ipc.read_record_batch(batch_msg, schema){code}
>  
> The associated (tiny) PR on GitHub implements this reading by binding the existing C++ function.



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