Uploaded image for project: 'Spark'
  1. Spark
  2. SPARK-24500

UnsupportedOperationException when trying to execute Union plan with Stream of children

    XMLWordPrintableJSON

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 2.3.0
    • Fix Version/s: 2.4.0
    • Component/s: SQL
    • Labels:
      None

      Description

      To reproduce:

      import org.apache.spark.sql.catalyst.plans.logical._
      def range(i: Int) = Range(1, i, 1, 1)
      val union = Union(Stream(range(3), range(5), range(7)))
      spark.sessionState.planner.plan(union).next().execute()
      

      produces

      java.lang.UnsupportedOperationException
        at org.apache.spark.sql.execution.PlanLater.doExecute(SparkStrategies.scala:55)
        at org.apache.spark.sql.execution.SparkPlan$$anonfun$execute$1.apply(SparkPlan.scala:131)
        at org.apache.spark.sql.execution.SparkPlan$$anonfun$execute$1.apply(SparkPlan.scala:127)
        at org.apache.spark.sql.execution.SparkPlan$$anonfun$executeQuery$1.apply(SparkPlan.scala:155)
        at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151)
        at org.apache.spark.sql.execution.SparkPlan.executeQuery(SparkPlan.scala:152)
      

      The SparkPlan looks like this:

      :- Range (1, 3, step=1, splits=1)
      :- PlanLater Range (1, 5, step=1, splits=Some(1))
      +- PlanLater Range (1, 7, step=1, splits=Some(1))
      

      So not all of it was planned (some PlanLater still in there).
      This appears to be a longstanding issue.
      I traced it to the use of var in TreeNode.
      For example in mapChildren:

              case args: Traversable[_] => args.map {
                case arg: TreeNode[_] if containsChild(arg) =>
                  val newChild = f(arg.asInstanceOf[BaseType])
                  if (!(newChild fastEquals arg)) {
                    changed = true
      

      If args is a Stream then changed will never be set here, ultimately causing the method to return the original plan.

        Attachments

          Activity

            People

            • Assignee:
              hvanhovell Herman van Hövell
              Reporter:
              bograd Bogdan Raducanu
            • Votes:
              0 Vote for this issue
              Watchers:
              3 Start watching this issue

              Dates

              • Created:
                Updated:
                Resolved: