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Wes McKinney authored and Krisztián Szűcs committed a7f354fc7d7
ARROW-2136: [Python] Check null counts for non-nullable fields when converting from pandas.DataFrame with supplied schema Author: Wes McKinney <wesm+git@apache.org> Closes #4683 from wesm/ARROW-2136 and squashes the following commits: 4bcae1bf2 <Wes McKinney> Check null counts for non-nullable fields when converting from pandas DataFrame with supplied schema