Github user mallman commented on a diff in the pull request:

    https://github.com/apache/spark/pull/16578#discussion_r142119164
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/QueryPlanConstraints.scala
 ---
    @@ -77,20 +77,21 @@ trait QueryPlanConstraints { self: LogicalPlan =>
         constraint match {
           // When the root is IsNotNull, we can push IsNotNull through the 
child null intolerant
           // expressions
    -      case IsNotNull(expr) => 
scanNullIntolerantAttribute(expr).map(IsNotNull(_))
    +      case IsNotNull(expr) => 
scanNullIntolerantField(expr).map(IsNotNull(_))
           // Constraints always return true for all the inputs. That means, 
null will never be returned.
           // Thus, we can infer `IsNotNull(constraint)`, and also push 
IsNotNull through the child
           // null intolerant expressions.
    -      case _ => scanNullIntolerantAttribute(constraint).map(IsNotNull(_))
    +      case _ => scanNullIntolerantField(constraint).map(IsNotNull(_))
    --- End diff --
    
    > I don't believe this is covered in the current unit tests, so I will add 
or modify a test to cover it.
    
    I added the following test to cover this case:
    
    
https://github.com/apache/spark/blob/88786d3eaf9d3a3d2c80c2235c5014074ade3dc1/sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetSchemaPruningSuite.scala#L62-L79


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