[info] java.util.NoSuchElementException: next on empty iterator [info] at scala.collection.Iterator$$anon$2.next(Iterator.scala:39) [info] at scala.collection.Iterator$$anon$2.next(Iterator.scala:37) [info] at scala.collection.IndexedSeqLike$Elements.next(IndexedSeqLike.scala:64) [info] at scala.collection.IterableLike$class.head(IterableLike.scala:91) [info] at scala.collection.mutable.ArrayOps$ofRef.scala$collection$IndexedSeqOptimized$$super$head(ArrayOps.scala:108) [info] at scala.collection.IndexedSeqOptimized$class.head(IndexedSeqOptimized.scala:120) [info] at scala.collection.mutable.ArrayOps$ofRef.head(ArrayOps.scala:108) [info] at org.apache.spark.sql.catalyst.plans.logical.LogicalPlan$$anonfun$2.apply(LogicalPlan.scala:68) [info] at org.apache.spark.sql.catalyst.plans.logical.LogicalPlan$$anonfun$2.apply(LogicalPlan.scala:65) [info] at scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:251) [info] at scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:251) [info] at scala.collection.immutable.List.foreach(List.scala:318) [info] at scala.collection.TraversableLike$class.flatMap(TraversableLike.scala:251) [info] at scala.collection.AbstractTraversable.flatMap(Traversable.scala:105) [info] at org.apache.spark.sql.catalyst.plans.logical.LogicalPlan.resolve(LogicalPlan.scala:65) [info] at org.apache.spark.sql.catalyst.analysis.Analyzer$ResolveReferences$$anonfun$apply$3$$anonfun$applyOrElse$2.applyOrElse(Analyzer.scala:100) [info] at org.apache.spark.sql.catalyst.analysis.Analyzer$ResolveReferences$$anonfun$apply$3$$anonfun$applyOrElse$2.applyOrElse(Analyzer.scala:97) [info] at org.apache.spark.sql.catalyst.trees.TreeNode.transformDown(TreeNode.scala:165) [info] at org.apache.spark.sql.catalyst.plans.QueryPlan.org$apache$spark$sql$catalyst$plans$QueryPlan$$transformExpressionDown$1(QueryPlan.scala:51) [info] at org.apache.spark.sql.catalyst.plans.QueryPlan$$anonfun$1$$anonfun$apply$1.apply(QueryPlan.scala:65) [info] at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244) [info] at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)