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Korn, UweWes McKinney
90eeb4a2d3d
Korn, Uwe authored and Wes McKinney committed 6933c6709b4
ARROW-4367: [C++] StringDictionaryBuilder segfaults on Finish with only null entries

Author: Korn, Uwe <Uwe.Korn@blue-yonder.com>

Closes #3483 from xhochy/ARROW-4367 and squashes the following commits:

82f0c7af <Korn, Uwe> Review comments
7f65a92d <Korn, Uwe> ARROW-4367:  StringDictionaryBuilder segfaults on Finish with only null entries