Github user davies commented on a diff in the pull request: https://github.com/apache/spark/pull/15363#discussion_r85388456 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala --- @@ -373,6 +373,11 @@ object SQLConf { .booleanConf .createWithDefault(true) + val STARJOIN_OPTIMIZATION = SQLConfigBuilder("spark.sql.starJoinOptimization") + .doc("When true, it enables join reordering based on star schema detection. ") + .booleanConf + .createWithDefault(false) --- End diff -- Should we use a internal config and enable this by default to have better test coverage?
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