Github user liufengdb commented on a diff in the pull request:
https://github.com/apache/spark/pull/20407#discussion_r167352400
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala ---
@@ -156,6 +156,15 @@ object SQLConf {
.booleanConf
.createWithDefault(true)
+ val ALLOW_NESTEDJOIN_FALLBACK =
buildConf("spark.sql.join.broadcastJoinFallback.enabled")
--- End diff --
nit: the key can be `spark.sql.join.broadcastNestedLoopJoin.enabled`
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