Github user liancheng commented on the pull request:

    https://github.com/apache/spark/pull/5369#issuecomment-90156494
  
    Thanks for working on this! Left several commented about styling. However, 
I just realized that adding a new method `supportPredicate` in 
`PrunedFilteredScan` breaks backwards compatibility of the data sources API. 
This makes hesitant to have this.
    
    Incidentally, I just wrote a design doc for improving data sources API and 
adding partitioning support to it. This very issue is also covered by adding a 
new trait rather than a new method to an existing trait. This doc should 
probably be made public very soon. Would you mind me revisiting this later? 
I'll keep you updated.


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