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https://issues.apache.org/jira/browse/ARROW-2627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16491811#comment-16491811
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Antoine Pitrou commented on ARROW-2627:
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You can pass an {{OSFile}} or {{MemoryMappedFile}} instance to {{ParquetFile}},
though, no? If so, I'm not sure it makes sense to add another way for the user
to choose the instantiated file reader class.
> [Python] Add option (or some equivalent) to toggle memory mapping
> functionality when using parquet.ParquetFile or other read entry points
> -----------------------------------------------------------------------------------------------------------------------------------------
>
> Key: ARROW-2627
> URL: https://issues.apache.org/jira/browse/ARROW-2627
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Python
> Reporter: Wes McKinney
> Priority: Major
>
> See issue described in https://github.com/apache/arrow/issues/1946. When
> passing a filename to {{parquet.ParquetFile}}, one cannot control what kind
> of file reader internally is created (OSFile or MemoryMappedFile)
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