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https://issues.apache.org/jira/browse/ARROW-360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15794271#comment-15794271
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Uwe L. Korn commented on ARROW-360:
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The dummy implementation won't be worse for the current case. I intend to built
a custom allocator based on {{jemalloc}} which should be able to do alligned
{{realloc(x)}} calls (see http://jemalloc.net/jemalloc.3.html). As I'm not sure
about the implications of linking {{jemalloc}}, I would provide a leaf library
{{libarrow_jemalloc}}
> C++: Add method to shrink PoolBuffer using realloc
> --------------------------------------------------
>
> Key: ARROW-360
> URL: https://issues.apache.org/jira/browse/ARROW-360
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Uwe L. Korn
> Assignee: Uwe L. Korn
>
> In the case where we have optimistically allocated a large PoolBuffer, we
> could shrink it later again using a call to {{realloc}}. This should free the
> exceeding memory but avoids an actual {{memcpy}}.
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