Github user wzhfy commented on a diff in the pull request: https://github.com/apache/spark/pull/17138#discussion_r104281601 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/CatalystConf.scala --- @@ -60,6 +60,12 @@ trait CatalystConf { * Enables CBO for estimation of plan statistics when set true. */ def cboEnabled: Boolean + + /** Enables join reorder in CBO. */ + def joinReorderEnabled: Boolean --- End diff -- `cboEnabled` controls all things related to stats computation, I think we may need a separate flag for join reorder only.
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