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https://issues.apache.org/jira/browse/ARROW-3906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16703392#comment-16703392
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Wes McKinney commented on ARROW-3906:
-------------------------------------

Sounds fine to me. I think it could be useful to have a subdirectory to collect 
implementation h / cc files. This could be called columnar / or array/ or 
similar. 

> [C++] Break builder.cc into multiple compilation units
> ------------------------------------------------------
>
>                 Key: ARROW-3906
>                 URL: https://issues.apache.org/jira/browse/ARROW-3906
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>    Affects Versions: 0.11.1
>            Reporter: Antoine Pitrou
>            Priority: Major
>
> To improve readability I suggest splitting {{builder.cc}} into independent 
> compilation units. Concrete builder classes are generally independent of each 
> other. The only concern is whether inlining some of the base class 
> implementations is important for performance.
> This would also make incremental compilation faster when changing one of the 
> concrete classes.



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