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https://issues.apache.org/jira/browse/ARROW-9863?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17185185#comment-17185185
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Antoine Pitrou commented on ARROW-9863:
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This should be easily solved by using `static` singletons. Do you want to
submit a PR?
> [C++] [PARQUET] Optimize meta data recovery of ApplicationVersion
> -----------------------------------------------------------------
>
> Key: ARROW-9863
> URL: https://issues.apache.org/jira/browse/ARROW-9863
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Affects Versions: 1.0.0
> Reporter: Pierre Belzile
> Priority: Major
>
> The class contains two large regexes which are compiled in the
> ApplicationVersion::ApplicationVersion(const std:::string) constructor. This
> is the constructor that is used when reading files.
> I stopped a server in gdb that had been processing several files at once and
> 4 threads out of 8 were building those regexes!
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