yangxk1 opened a new pull request, #706:
URL: https://github.com/apache/incubator-graphar/pull/706

   ### Reason for this PR
   
   This PR addresses the feature request in #397 and improves upon PR:#697 by 
automatically selecting `Scanner` or `FileReader`. Using `Scanner` when 
predicate pushdown is available, and falling back to `FileReader` when it is 
not.
   
   ### What changes are included in this PR?
   
   If predicate pushdown is available, the selected columns are pushed down 
into `FilterOptions.columns`.
   Otherwise, the `FileReader` is used to read only the selected columns. 
   
   ### Are these changes tested?
   
   yes, as in #697 
   
   ### Are there any user-facing changes?
   
   yes, as in #697
   


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