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Benjamin Kietzman
42750002db0
Benjamin Kietzman authored 842d5135717
ARROW-9476: [C++][Dataset] Fix incorrect dictionary association in HivePartitioningFactory

In the presence of multiple fields, it was possible (non-deterministically) that the field->dictionary association could be scrambled.

Closes #7770 from bkietz/9476-multiple-dict-partition-fields

Authored-by: Benjamin Kietzman <bengilgit@gmail.com>
Signed-off-by: Benjamin Kietzman <bengilgit@gmail.com>