[jira] [Assigned] (ARROW-12650) [Doc][Python] Improve documentation regarding dealing with memory mapped files

["Alessandro Molina (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-12650?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alessandro Molina reassigned ARROW-12650:
-----------------------------------------

    Assignee: Alessandro Molina

> [Doc][Python] Improve documentation regarding dealing with memory mapped files
> ------------------------------------------------------------------------------
>
>                 Key: ARROW-12650
>                 URL: https://issues.apache.org/jira/browse/ARROW-12650
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Documentation
>            Reporter: Alessandro Molina
>            Assignee: Alessandro Molina
>            Priority: Minor
>
> While one of the Arrow promises is that it makes easy to read/write data bigger than memory, it's not immediately obvious from the pyarrow documentation how to deal with memory mapped files.
> We hint that you can open files as memory mapped ( [https://arrow.apache.org/docs/python/memory.html?highlight=memory_map#on-disk-and-memory-mapped-files] ) but then we don't explain how to read/write Arrow Arrays or Tables from there.
> While most high level functions to read/write formats (pqt, feather, ...) have an easy to guess {{memory_map=True}} option, we don't have any example of how that is meant to work for Arrow format itself. For example how you can do that using {{RecordBatchFile*}}. 
> An addition to the memory mapping section that makes a more meaningful example that reads/writes actual arrow data (instead of plain bytes) would probably be more helpful



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