[jira] [Commented] (ARROW-711) [C++] Remove extern template declarations for NumericArray types

["Wes McKinney (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-711?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15941861#comment-15941861 ] 

Wes McKinney commented on ARROW-711:
------------------------------------

PR: https://github.com/apache/arrow/pull/441

> [C++] Remove extern template declarations for NumericArray<T> types
> -------------------------------------------------------------------
>
>                 Key: ARROW-711
>                 URL: https://issues.apache.org/jira/browse/ARROW-711
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: C++
>            Reporter: Wes McKinney
>            Assignee: Wes McKinney
>
> It seems that linkers have diverging semantics around visibility when using the {{extern template}} declaration (see linker errors in https://ci.appveyor.com/project/ApacheSoftwareFoundation/arrow/build/1.0.841). Since the only thing impacted right now is the {{NumericArray<T>}} constructor, removing these doesn't seem too onerous. I ran the existing benchmarks and looked at the library sizes before and after, and there doesn't appear to be a meaningful difference. 



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