[jira] [Created] (ARROW-3947) query distinct values of a given partition from a ParquetDataset
Ji Xu created ARROW-3947:
Summary: query distinct values of a given partition from a ParquetDataset
Project: Apache Arrow
Issue Type: New Feature
Affects Versions: 0.10.0
Environment: MacOSX, Python 3.6,
Reporter: Ji Xu
Right now the values of a given partition from a `ParquetDataset` is buried inside `ParquetDataset.pieces`, a bit inconvenient for the user to dig out this information. A helper function/method to perform this task in `ParquetDataset` class would be very helpful for the users.
A pure personal opinion on the name of this method: `ParquetDataset.select_distinct()` with partition_name as the positional arg, to resemble SQL `SELECT DISTINCT column FROM table`.
I'm not sure how to contribute here on Jira, so I created this [GitHub Gist |https://gist.github.com/xujiboy/c3fcc47f720ed9adf2260c5d0ba8aed2]as an possible solution for this problem.
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