ARROW-1079: [Python] Filter out private directories when building Parquet dataset manifest #860
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Change-Id: I2a22cef9c4e7712c013c772e98c34126d4580c5b
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Some systems like Hive and Impala use special files or directories to signal to other readers that a dataset modification is in progress. If such directories (starting with an underscore) exist in a flat Parquet directory, it currently breaks the dataset reader.