bkietz edited a comment on pull request #7907:
URL: https://github.com/apache/arrow/pull/7907#issuecomment-669936148
> And the "partition base directory" is automatically set if a user does
something like ds.dataset("_shouldnt_be_ignored/dataset/") ?
Currently in python the partition_base_dir is always identical to the base
directory of the recursive selector used, so yes.
In principle it would be possible to select `/mnt/data/**` and set
`partition_base_dir=/mnt/data/partitioned`, in which case `/mnt/data/other/**`
would be included in the dataset but would not have partition information
attached. Alternatively, one could set `partition_base_dir=/mnt` and select
`/mnt/year=2020/**`, in which case all fragments would include the `"year"_ ==
2020` partition expression. I question the utility of these cases, honestly.
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