Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/1151#discussion_r14469249
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/basicOperators.scala ---
@@ -205,3 +205,18 @@ object ExistingRdd {
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 `left` that are not in `right`.
--- End diff --
I think this comment can just read: "Returns an table with the elements
from `left` that are not in `right` using the built-in spark `subtract`
function" Also please name this `Except` to match the logical node.
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