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https://issues.apache.org/jira/browse/ARROW-7942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17049519#comment-17049519
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Antoine Pitrou commented on ARROW-7942:
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I tried different micro-optimizations (on gcc 7.4, clang 9.0) and came to the
conclusion that there is no obvious way to improve performance. It's not easy
to get the compiler to produce better code, even when unrolling loops by hand.
> [C++][Parquet] Examine Arrow-decoding perf regressions introduced by
> PARQUET-1797
> ---------------------------------------------------------------------------------
>
> Key: ARROW-7942
> URL: https://issues.apache.org/jira/browse/ARROW-7942
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Wes McKinney
> Priority: Major
>
> See discussion at
> https://github.com/apache/arrow/pull/6440#issuecomment-591053705
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