Benjamin Kietzman created ARROW-4698:
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             Summary: [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
            Reporter: Benjamin Kietzman
            Assignee: Benjamin Kietzman


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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