Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/8953#discussion_r41345489
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/local/HashJoinNode.scala
---
@@ -24,19 +24,33 @@ import org.apache.spark.sql.execution.joins._
import org.apache.spark.sql.execution.metric.SQLMetrics
/**
+ * A node for inner hash equi-join. It can be used individually or wrapped
by other
+ * inner hash equi-join nodes such as [[BinaryHashJoinNode]]. This node
takes a already
+ * built [[HashedRelation]] and a [[LocalNode]] representing the streamed
side.
+ * If this node is used individually, `isWrapped` should be set to false.
+ * If this node is wrapped in another node, `isWrapped` should be set to
true
--- End diff --
As discussed offline, it might be better to put the common code in a trait
instead of wrapping local nodes. Right now it's kind of confusing because
sometimes we call `prepare` or `close` but sometimes we don't.
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