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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