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Antoine PitrouWes McKinney
3330d660643
Antoine Pitrou authored and Wes McKinney committed 6b496f7c192
ARROW-3997: [Documentation] Clarify dictionary index type

Mandate signed integers for dictionary index types, without constraining integer width.

Author: Antoine Pitrou <antoine@python.org>

Closes #3355 from pitrou/ARROW-3997-dictionary-encoding-doc and squashes the following commits:

4e05e2642 <Antoine Pitrou> ARROW-3997:  Clarify dictionary index type