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https://issues.apache.org/jira/browse/ARROW-5102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16839567#comment-16839567
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Antoine Pitrou commented on ARROW-5102:
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Also see
https://aras-p.info/blog/2019/01/16/time-trace-timeline-flame-chart-profiler-for-Clang/
clang 9.0 will hopefully help us tackle this much more rationally.
> [C++] Reduce header dependencies
> --------------------------------
>
> Key: ARROW-5102
> URL: https://issues.apache.org/jira/browse/ARROW-5102
> Project: Apache Arrow
> Issue Type: Wish
> Components: C++
> Affects Versions: 0.13.0
> Reporter: Antoine Pitrou
> Priority: Major
> Fix For: 0.14.0
>
>
> To tame C++ compile times, we should try to reduce the number of heavy
> dependencies in our .h files.
> Two possible avenues come to mind:
> * avoid including `unordered_map` and friends
> * avoid including C++ stream libraries (such as `iostream`, `ios`,
> `sstream`...)
> Unfortunately we're currently including `sstream` in `status.h` for some
> template APIs. We may move those to a separate include file (e.g.
> `status-builder.h`).
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