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Antoine PitrouKorn, Uwe
2d278ab896c
Antoine Pitrou authored and Korn, Uwe committed 3d7a5a64732
ARROW-2074: [Python] Infer lists of dicts as struct arrays

Also refactor the type inference visitor and remove the superfluous separate SeqVisitor; improve inference visitor performance by 30%; and add a struct type inference benchmark.

Author: Antoine Pitrou <antoine@python.org>

Closes #1935 from pitrou/ARROW-2074-infer-dict-lists and squashes the following commits:

13ed6c30 <Antoine Pitrou> Fix tests on 2.7
3baa2eac <Antoine Pitrou> ARROW-2074:  Infer lists of dicts as struct arrays