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Wes McKinneyUwe L. Korn
8edd62e1bda
Wes McKinney authored and Uwe L. Korn committed 51046a0ac80
ARROW-1961: [Python] Preserve pre-existing schema metadata in Parquet files when passing flavor='spark'

Author: Wes McKinney <wes.mckinney@twosigma.com>

Closes #1511 from wesm/ARROW-1961 and squashes the following commits:

e13b6b4 [Wes McKinney] Preserve pre-existing schema metadata when sanitizing fields when passing flavor='spark'