dbtsai edited a comment on issue #23343: [SPARK-26390][SQL] ColumnPruning rule 
should only do column pruning
URL: https://github.com/apache/spark/pull/23343#issuecomment-449178914
 
 
   @gatorsmile for example, we were refactoring 
`ReplaceNullWithFalseInPredicate` out from `expressions.scala` as it grows too 
big, https://github.com/apache/spark/pull/23139/.
   
   I'm wondering when we should or should not do such refactoring. I create a 
PR https://github.com/apache/spark/pull/23359 so we can discuss over there. 

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