Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/17353#discussion_r106835632 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/CostBasedJoinReorder.scala --- @@ -201,7 +201,16 @@ object JoinReorderDP extends PredicateHelper { nextLevel.toMap } - /** Build a new join node. */ + /** + * Builds a new JoinPlan if the two given sides can be joined with some conditions. + * @param oneJoinPlan One side JoinPlan for building a new JoinPlan. + * @param otherJoinPlan The other side JoinPlan for building a new join node. + * @param conf SQLConf for statistics computation. + * @param conditions The overall set of join conditions. + * @param topOutput The output attributes of the final plan. + * @return Return a new JoinPlan if the two sides can be joined with some conditions. Otherwise, --- End diff -- How about? > Returns a new JoinPlan if there exists at least one join condition involving references from both left and right. Otherwise, returns None.
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