Commits
Joris Van den Bossche authored and Wes McKinney committed 7830ce34c9f
ARROW-7892: [Python] Add FileSystemDataset.format attribute Closes #6462 from jorisvandenbossche/dataset-various-api and squashes the following commits: 2a4070981 <Joris Van den Bossche> add more informative repr to Expression 865ccb575 <Joris Van den Bossche> ARROW-7892: Add FilesystemSource.format attribute Authored-by: Joris Van den Bossche <jorisvandenbossche@gmail.com> Signed-off-by: Wes McKinney <wesm+git@apache.org>