Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/1147#discussion_r15676602
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/joins.scala ---
@@ -37,6 +37,135 @@ case object BuildLeft extends BuildSide
@DeveloperApi
case object BuildRight extends BuildSide
+/**
+ * Constant Value for Binary Join Node
+ */
+object BinaryJoinNode {
+ val SINGLE_NULL_LIST = Seq[Row](null)
+ val EMPTY_NULL_LIST = Seq[Row]()
+}
+
+// TODO If join key was null should be considered as equal? In Hive this
is configurable.
+
+/**
+ * Output the tuples for the matched (with the same join key) join group,
base on the join types,
+ * Both input iterators should be repeatable.
+ */
+trait BinaryRepeatableIteratorNode extends BinaryNode {
+ self: Product =>
+
+ val leftNullRow = new GenericRow(left.output.length)
+ val rightNullRow = new GenericRow(right.output.length)
+
+ val joinedRow = new JoinedRow()
--- End diff --
I'm worried about having a mutable structure that isn't explicitly
allocated per partition. @rxin is doing a lot of work trying to make us more
efficient by broadcasting closures per job instead of serializing them per task
and I think this could break in subtle ways.
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