Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/1151#discussion_r14277491
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/basicOperators.scala ---
@@ -204,3 +204,17 @@ case class ExistingRdd(output: Seq[Attribute], rdd:
RDD[Row]) extends LeafNode {
override def execute() = rdd
}
+/**
+ * :: DeveloperApi ::
+ * This operator support the substract function .
+ * Return an table with the elements from `this` that are not in `other`.
+ */
+@DeveloperApi
+case class Subtract(left:SparkPlan,right:SparkPlan) extends BinaryNode {
+ // TODO:The input children:Seq[SparkPlan] should only contain two
SparkPlan
+ override def output = children.head.output
--- End diff --
Remove the comment and make this `left.output`.
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