paul-rogers opened a new pull request #1711: DRILL-7011: Support schema in scan 
framework
URL: https://github.com/apache/drill/pull/1711
 
 
   Adds schema support to the row set-based scan framework and to the "V3" text 
reader based on that framework.
   
   Adding the schema made clear that passing options as a long list of 
constructor arguments was not sustainable. Refactored code to use a builder 
pattern instead.
   
   Added support for default values in the "null column loader", which required 
adding a "setValue" method to the column accessors.
   
   Added unit tests for all new or changed functionality. See TestCsvWithSchema 
for the overall test of the entire integrated mechanism.

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