Github user wangyum commented on a diff in the pull request:
https://github.com/apache/spark/pull/19714#discussion_r153401195
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkStrategies.scala ---
@@ -153,6 +152,27 @@ abstract class SparkStrategies extends
QueryPlanner[SparkPlan] {
// --- BroadcastHashJoin
--------------------------------------------------------------------
+ case ExtractEquiJoinKeys(joinType, leftKeys, rightKeys, condition,
left, right)
--- End diff --
if users ask to broadcast both the join side in the hint will pick a
smaller side to broadcast according to stats
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