Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/22326#discussion_r215861685 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala --- @@ -1149,6 +1149,26 @@ object PushPredicateThroughJoin extends Rule[LogicalPlan] with PredicateHelper { (leftEvaluateCondition, rightEvaluateCondition, commonCondition ++ nonDeterministic) } + private def tryToGetCrossType(commonJoinCondition: Seq[Expression], j: LogicalPlan) = { + if (SQLConf.get.crossJoinEnabled) { + // if condition expression is unevaluable, it will be removed from + // the new join conditions, if all conditions is unevaluable, we should + // change the join type to CrossJoin. + logWarning(s"The whole commonJoinCondition:$commonJoinCondition of the join " + + "plan is unevaluable, it will be ignored and the join plan will be " + + s"turned to cross join. This plan shows below:\n $j") + Cross + } else { + // if the crossJoinEnabled is false, an AnalysisException will throw by + // [[CheckCartesianProducts]], we throw firstly here for better readable --- End diff -- tiny nit: we don't necessarily `[[..]]` in inlined comments. We can just leave it as is or ``` `...` ``` if you feel like you should. Feel free to address this with other comments.
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