cloud-fan commented on a change in pull request #34069:
URL: https://github.com/apache/spark/pull/34069#discussion_r713742152
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File path: docs/sql-ref-syntax-qry-select-hints.md
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@@ -126,6 +126,10 @@ Join hints allow users to suggest the join strategy that
Spark should use. Prior
Suggests that Spark use shuffle-and-replicate nested loop join.
+* **BROADCAST_NL**
+
+ Suggests that Spark use broadcast nested loop join. The join side with the
hint will be broadcast regardless of `autoBroadcastJoinThreshold`. If both
sides of the join have the broadcast hints, the one with the smaller size
(based on stats) will be broadcast.
Review comment:
should we highlight that this hint is useful when the join type is not
supported by hash join? and list these join types, such as full outer join
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