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-540666492
   I'm wondering whether it is not a priority or it wasn't easy to implement?
   If I want to implement it what class/interface should I extend? 
   Is it possible to do it in a custom `JDBC` source?
   Do you have any suggestions?
   The use case looks like this: there are 50M records in the DB I wanna select 
only 1M why I should read all of them?

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