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https://issues.apache.org/jira/browse/ARROW-8180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17063852#comment-17063852
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Antoine Pitrou commented on ARROW-8180:
---------------------------------------

If you don't put it in type_fwd.h then every function declaration with a 
{{MemoryPool* pool = default_memory_pool()}} needs to include 
{{memory_pool.h}}, no?

> [C++] Should default_memory_pool() be in arrow/type_fwd.h?
> ----------------------------------------------------------
>
>                 Key: ARROW-8180
>                 URL: https://issues.apache.org/jira/browse/ARROW-8180
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Wes McKinney
>            Priority: Major
>
> This seemed somewhat odd to me. It might be better from an IWYU-perspective 
> to move this to arrow/memory_pool.h



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