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java.lang.StackOverflowError: 	at scala.collection.immutable.Set$Set1.contains(Set.scala:84)	at scala.collection.immutable.Set$Set1.$plus(Set.scala:86)	at scala.collection.immutable.Set$Set1.$plus(Set.scala:81)	at scala.collection.mutable.SetBuilder.$plus$eq(SetBuilder.scala:22)	at scala.collection.mutable.SetBuilder.$plus$eq(SetBuilder.scala:20)	at scala.collection.generic.Growable$class.loop$1(Growable.scala:53)	at scala.collection.generic.Growable$class.$plus$plus$eq(Growable.scala:57)	at scala.collection.mutable.SetBuilder.$plus$plus$eq(SetBuilder.scala:20)	at scala.collection.TraversableLike$class.to(TraversableLike.scala:590)	at scala.collection.AbstractTraversable.to(Traversable.scala:104)	at scala.collection.TraversableOnce$class.toSet(TraversableOnce.scala:304)	at scala.collection.AbstractTraversable.toSet(Traversable.scala:104)	at org.apache.spark.sql.catalyst.trees.TreeNode.containsChild$lzycompute(TreeNode.scala:86)	at org.apache.spark.sql.catalyst.trees.TreeNode.containsChild(TreeNode.scala:86)	at org.apache.spark.sql.catalyst.trees.TreeNode$$anonfun$4.apply(TreeNode.scala:280)	at scala.collection.Iterator$$anon$11.next(Iterator.scala:409)