yjshen commented on pull request #811:
URL: https://github.com/apache/arrow-datafusion/pull/811#issuecomment-899268671


   > +1. @yjshen in your mind, is `SourceRootDescriptor` the right abstraction 
layer to handle the early partition based file filtering?
   
   My intention here at `SourceRootDescriptor` is to provide a base table with 
all its partitions, without taking any query-related info here. We can register 
the base table first, init the root descriptor once, and do partition filtering 
lazily when we trigger each query run based on its requirements and generate 
physical scan operator hereafter.


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