Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/10577#discussion_r49048219 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicOperators.scala --- @@ -123,6 +115,43 @@ case class Except(left: LogicalPlan, right: LogicalPlan) extends SetOperation(le override def output: Seq[Attribute] = left.output } +/** Factory for constructing new `Union` nodes. */ +object Union { + def apply(left: LogicalPlan, right: LogicalPlan): Union = { + Union (left :: right :: Nil) + } +} + +case class Union(children: Seq[LogicalPlan]) extends LogicalPlan { + + override def output: Seq[Attribute] = { + // updating nullability to make all the children consistent + children.tail.foldLeft(children.head.output) { case (currentOutput, child) => + currentOutput.zip(child.output).map { case (a1, a2) => + a1.withNullability(a1.nullable || a2.nullable) + } --- End diff -- Thank you!
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