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Krisztián SzűcsKorn, Uwe
664686416d4
Krisztián Szűcs authored and Korn, Uwe committed 1a922fdec87
ARROW-2593: [Python] TypeError: data type "mixed-integer" not understood

Both `name` and `field_name` is [enforced](https://github.com/apache/arrow/blob/master/python/pyarrow/pandas_compat.py#L167) to be a string, but that way we lose the type of it (an integer in this case).
Could We use one of it to preserve the original type of the column name?

Author: Krisztián Szűcs <szucs.krisztian@gmail.com>

Closes #2084 from kszucs/ARROW-2593 and squashes the following commits:

0e6d5330 <Krisztián Szűcs> maintain column order
9e0ad334 <Krisztián Szűcs> reconstruct columns from pandas mixed-integer type