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https://issues.apache.org/jira/browse/ARROW-7916?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ben Kietzman resolved ARROW-7916.
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Resolution: Fixed
Issue resolved by pull request 6474
[https://github.com/apache/arrow/pull/6474]
> [C++][Dataset] Project IPC record batches to materialized fields
> ----------------------------------------------------------------
>
> Key: ARROW-7916
> URL: https://issues.apache.org/jira/browse/ARROW-7916
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++, C++ - Dataset
> Affects Versions: 0.16.0
> Reporter: Ben Kietzman
> Assignee: Ben Kietzman
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.0.0
>
> Time Spent: 2h 10m
> Remaining Estimate: 0h
>
> If batches mmaped from disk are projected before post filtering, unreferenced
> columns will never be accessed (so the memory map shouldn't do I/O on them).
> At the same time, it'd probably be wise to explicitly document that batches
> yielded directly from fragments rather than from a Scanner will not be
> filtered or projected (so they will not match the fragment's schema and will
> include columns referenced by the filter even if they were not projected).
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