rafaelkyrdan commented on issue #19424: [SPARK-22197][SQL] push down operators 
to data source before planning
URL: https://github.com/apache/spark/pull/19424#issuecomment-540687736
 
 
   I think I found what I have to implement:
   `
   trait TableScan {
     def buildScan(): RDD[Row]
   }
   `
   am I right?

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