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https://issues.apache.org/jira/browse/ARROW-3165?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Antoine Pitrou resolved ARROW-3165.
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Resolution: Won't Do
Probably not worth the hassle.
> [CI] Cache externals accross AppVeyor builds
> --------------------------------------------
>
> Key: ARROW-3165
> URL: https://issues.apache.org/jira/browse/ARROW-3165
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++, Continuous Integration
> Reporter: Antoine Pitrou
> Priority: Major
>
> Downloading and building third-party libraries may be consuming a significant
> chunk of time in our CI chain. It would be nice to cache third-party build
> artifacts accross CI builds, to save time.
> Unfortunately I ran accross weird issues (especially on Windows / AppVeyor)
> when trying to implement this. I don't plan to waste any more time on this
> soon. Attempt at
> [https://github.com/apache/arrow/compare/master...pitrou:externals_dir]
> Edit: it seems I finally found the issue on Windows: ninja is case-sensitive,
> you must be careful to canonicalize paths yourself in custom CMake commands
> such as in ExternalProject_Add...
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