tustvold commented on PR #4601:
URL: 
https://github.com/apache/arrow-datafusion/pull/4601#issuecomment-1349647791

   > the rationale that any opener that needs a object_store reference should 
obtain one as part of construction (rather than requiring it on the trait)?
   
   The rationale is that some users are not using ObjectStore at all, and are 
using ParquetFileReaderFactory to provide a custom AsyncFileReader to the 
parquet crate's async reader. The FileStream plumbing, however, still required 
an ObjectStore necessitating a dummy object to be propagated through only to be 
ignored.


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