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François Saint-Jacques authored and Wes McKinney committed dd1ab19907e
ARROW-3586: [Python] Add test ensuring no segfault As reported in ARROW-3586, a conversion to categorical on an empty array would trigger a segfault. This test ensure it is safe to do. Author: François Saint-Jacques <fsaintjacques@gmail.com> Closes #3116 from fsaintjacques/ARROW-3586-segfault and squashes the following commits: 7f779f1bf <François Saint-Jacques> ARROW-3586: Add test ensuring no segfault