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

    https://github.com/apache/spark/pull/10844#discussion_r51068499
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicOperators.scala
 ---
    @@ -88,6 +88,12 @@ case class Generate(
     
     case class Filter(condition: Expression, child: LogicalPlan) extends 
UnaryNode {
       override def output: Seq[Attribute] = child.output
    +
    +  override def constraints: Set[Expression] = {
    +    val newConstraint = splitConjunctivePredicates(condition).filter(
    +      _.references.subsetOf(outputSet)).toSet
    --- End diff --
    
    style nit: we typically avoid breaking in the middle of a function call and 
instead prefer to break in between calls (always pick the highest syntactic 
level)
    
    ```scala
    val newConstraint = splitConjunctivePredicates(condition)
      .filter(_.references.subsetOf(outputSet))
      .toSet
    ```


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