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Antoine PitrouWes McKinney
277307de446
Antoine Pitrou authored and Wes McKinney committed 532450d9cdf
ARROW-5179: [Python] Return plain dicts, not OrderedDict, on Python 3.7+

Starting with Python 3.7, built-in dict is insertion-ordered.
No need to return a slightly heavier and costlier OrderedDict.

Author: Antoine Pitrou <antoine@python.org>

Closes #4190 from pitrou/ARROW-5179 and squashes the following commits:

799727ba9 <Antoine Pitrou> ARROW-5179:  Return plain dicts, not OrderedDict, on Python 3.7+