Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/837#discussion_r13262640
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/joins.scala ---
@@ -144,6 +144,150 @@ case class HashJoin(
* :: DeveloperApi ::
--- End diff --
I realize that we aren't particularly good about this in most of the other
physical operators, but could you add some Scala doc here about how this
operator works and what the expected performance characteristics are? Same
below. The goal of the Scala doc for physical operators should be to make it
easy for people to understand query plans that are printed out by EXPLAIN.
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