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https://issues.apache.org/jira/browse/ARROW-14025?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17424136#comment-17424136
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David Li commented on ARROW-14025:
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Ah, yeah, we shouldn't just override them completely, you're right.

> [R][C++] PreBuffer is not enabled when scanning parquet via exec nodes
> ----------------------------------------------------------------------
>
>                 Key: ARROW-14025
>                 URL: https://issues.apache.org/jira/browse/ARROW-14025
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++, R
>            Reporter: Weston Pace
>            Assignee: Neal Richardson
>            Priority: Major
>             Fix For: 6.0.0
>
>
> In ExecNode_Scan a ScanOptions object is built up.  If we are reading parquet 
> we should enable pre-buffering.  This is done by creating a 
> ParquetFragmentScanOptions object and enabling pre-buffering.
> Alternatively, we could just default pre-buffering to true for asynchronous 
> scans of parquet data.



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