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https://issues.apache.org/jira/browse/ARROW-4698?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16820200#comment-16820200
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Antoine Pitrou commented on ARROW-4698:
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Do you still need this?
Another possibility would be to implement a caching memory pool (ARROW-3406).
> [C++] Let StringBuilder be constructible with a pre allocated buffer for
> character data
> ---------------------------------------------------------------------------------------
>
> Key: ARROW-4698
> URL: https://issues.apache.org/jira/browse/ARROW-4698
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Benjamin Kietzman
> Assignee: Benjamin Kietzman
> Priority: Minor
>
> This is useful for example when an existing buffer can be immediately reused.
> This is currently used for [storage of strings in json
> parsing](https://github.com/apache/arrow/blob/master/cpp/src/arrow/json/parser.cc#L60),
> so it'd be straightforward to refactor into a constructor of StringBuilder.
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