yjshen commented on pull request #950:
URL: https://github.com/apache/arrow-datafusion/pull/950#issuecomment-907836854


   Thanks @rdettai @houqp  for the optional delimiter. 
   
   I was thinking `list` API could deal with multiple partition columns by 
listing one directory at a time for filesystems (instead of listing leaf files 
recursively for non-partitioned tables), therefore could achieve a lazy listing 
when implementing ObjectStore.
   
   After taking both partitioned and non-partitioned tables in one remote 
storage into consideration, this original `list` signature would lead to two 
`ObjectStore` implementations for one storage system, one for partitioned and 
one for non-partitioned. It's wired. I like the idea of an optional delimiter 
because it brings a lot of flexibility. 


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