Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/12668#discussion_r61088744
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkStrategies.scala ---
@@ -107,16 +80,28 @@ private[sql] abstract class SparkStrategies extends
QueryPlanner[SparkPlan] {
* - Shuffle hash join: if the average size of a single partition is
small enough to build a hash
* table.
* - Sort merge: if the matching join keys are sortable.
+ *
+ * If there is no joining keys, Join implementations are chosen with the
following precedence:
+ * - BroadcastNestedLoopJoin: if one side of the join could be
broadcasted
--- End diff --
NIT: can be broadcasted
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