houqp commented on pull request #950:
URL: https://github.com/apache/arrow-datafusion/pull/950#issuecomment-907815987


   Thanks @rdettai for the detailed google doc write up. I left some comments 
there :) I think the object store interface proposed in this PR does support 
listing object keys with partition prefixes, for example: 
`ObjectStore::lsit("bucket/path/date=2018")`. But it's missing an important 
argument `delimiter`, which is required to make "folder" hierarchy discovery 
more efficient in object stores.


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