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https://issues.apache.org/jira/browse/ARROW-13126?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jayjeet Chakraborty closed ARROW-13126.
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Resolution: Fixed
> Read out only the required columns from a Feather file on Disk
> --------------------------------------------------------------
>
> Key: ARROW-13126
> URL: https://issues.apache.org/jira/browse/ARROW-13126
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Jayjeet Chakraborty
> Priority: Major
>
> The LZ4 compressed feather format works really well and is quite nice and
> fast than Parquet when reading all the columns out. For single columns, looks
> like feather format does not yet support the capability to read out only the
> required columns from the disk. Are there any plans to add support for this?
> Here are some numbers to support my claim from an experiment with a table
> with 17 columns and 5 million rows in uncompressed parquet and LZ4 compressed
> feather format. No memory mapping involved.
>
> pq_all_cols: 0.4179724836349487 ms
> feather_all_cols: 0.26202451705932617 ms
> pq_single_col: 0.10951032638549804 ms
> feather_single_col: 0.2119576358795166 ms
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