Github user nsyca commented on a diff in the pull request: https://github.com/apache/spark/pull/17520#discussion_r109519783 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala --- @@ -792,6 +824,39 @@ object PushDownPredicate extends Rule[LogicalPlan] with PredicateHelper { filter } + // Similar to the above Filter over Window + // LeftSemi/LeftAnti over Window + case join @ Join(w: Window, rightOp, LeftSemiOrAnti(joinType), joinCond) + if w.partitionSpec.forall(_.isInstanceOf[AttributeReference]) => + if (joinCond.isEmpty) { + // No join condition, just push down Join below Window + w.copy(child = Join(w.child, rightOp, joinType, joinCond)) + } else { + val partitionAttrs = AttributeSet(w.partitionSpec.flatMap(_.references)) ++ + rightOp.outputSet + + val (candidates, containingNonDeterministic) = + splitConjunctivePredicates(joinCond.get).span(_.deterministic) + + val (pushDown, rest) = candidates.partition { cond => + cond.references.subsetOf(partitionAttrs) && + !SubqueryExpression.hasCorrelatedSubquery(cond) && + !SubExprUtils.containsOuter(cond) + } + + val stayUp = rest ++ containingNonDeterministic + + if (pushDown.nonEmpty) { + val pushDownPredicate = pushDown.reduce(And) + val newPlan = w.copy(child = Join(w.child, rightOp, joinType, Option(pushDownPredicate))) + if (stayUp.isEmpty) newPlan else Filter(stayUp.reduce(And), newPlan) + } else { + // The join condition is not a subset of the Window's PARTITION BY clause, + // no push down. + join + } + } + --- End diff -- [To reviewers] Should we separate this into a new rule?
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