vvysotskyi opened a new pull request #2119:
URL: https://github.com/apache/drill/pull/2119


   # [DRILL-7771](https://issues.apache.org/jira/browse/DRILL-7771): Order by 
and limit transactions in RDBMS cannot be pushdown
   
   ## Description
   - Introduced `DrillJdbcSort` to have the cost for limit queries that 
correspond to Drill's limit cost.
   - Provided the ability to apply some JDBC rules after the logical planning 
phase. All other JDBC rules will be addressed in 
https://issues.apache.org/jira/browse/CALCITE-4423.
   - Added unit tests
   
   ## Documentation
   NA
   
   ## Testing
   Added unit tests for the cases that were broken earlier.
   


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