[I] [Python] Support `requested_schema` in `__arrow_c_stream__` implementations [arrow]

["paleolimbot (via GitHub)" <gi...@apache.org>]

paleolimbot opened a new issue, #40066:
URL: https://github.com/apache/arrow/issues/40066

   ### Describe the enhancement requested
   
   As noted in https://github.com/apache/arrow/pull/39985#discussion_r1486364432 , we have a few ways available to us to cast a stream of record batches, and ideally we would do this batch-wise. In https://github.com/apache/arrow/pull/39985 I attempted a simple solution using `Table.cast()`; however, this was a little too simple and lazily-cast-per-batch solution will also make this work for the `RecordBatchReader` implementation.
   
   I'm game to attempt a C++ solution to this...it is possible to do this using the "record batch from iterable" approach, too, but I think the C++ is reasonably compact and would avoid any involvement of the GIL/Python interpreter that could impact performance when using `requested_schema`.
   
   ### Component(s)
   
   Python


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Re: [I] [Python] Support `requested_schema` in `__arrow_c_stream__` implementations [arrow]

["jorisvandenbossche (via GitHub)" <gi...@apache.org>]

jorisvandenbossche closed issue #40066: [Python] Support `requested_schema` in `__arrow_c_stream__` implementations
URL: https://github.com/apache/arrow/issues/40066


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