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

    https://github.com/apache/spark/pull/11665#discussion_r56239534
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
 ---
    @@ -78,7 +78,7 @@ abstract class Optimizer extends 
RuleExecutor[LogicalPlan] {
           CombineLimits,
           CombineUnions,
           // Constant folding and strength reduction
    -      NullFiltering,
    +      InferFiltersFromConstraints,
    --- End diff --
    
    This rule doesn't seem related to the comment above it (same for 
nullfiltering)


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