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Phillip Cloud authored and Wes McKinney committed edfb2dca81d
ARROW-1027: [Python] Allow negative indexing in fields/columns on pyarrow Table and Schema objects Negative indexing causes an interpreter segfault right now. After this PR, no segfaults, and reasonable error messages for out of bounds indexes. Author: Phillip Cloud <cpcloud@gmail.com> Closes #686 from cpcloud/ARROW-1027 and squashes the following commits: 1bfcef4 [Phillip Cloud] ARROW-1027: [Python] Allow negative indexing in fields/columns on pyarrow Table and Schema objects