Github user sameeragarwal commented on a diff in the pull request: https://github.com/apache/spark/pull/15319#discussion_r84646230 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/QueryPlan.scala --- @@ -74,20 +74,98 @@ abstract class QueryPlan[PlanType <: QueryPlan[PlanType]] extends TreeNode[PlanT * additional constraint of the form `b = 5` */ private def inferAdditionalConstraints(constraints: Set[Expression]): Set[Expression] = { + // Collect alias from expressions to avoid producing non-converging set of constraints + // for recursive functions. + // + // Don't apply transform on constraints if the replacement will cause an recursive deduction, + // when that happens a non-converging set of constraints will be created and finally throw + // OOM Exception. + // For more details, refer to https://issues.apache.org/jira/browse/SPARK-17733 + val aliasMap = AttributeMap((expressions ++ children.flatMap(_.expressions)).collect { + case a: Alias => (a.toAttribute, a.child) + }) + + val equalExprSets = generateEqualExpressionSets(constraints, aliasMap) --- End diff -- nit: How about calling them `val constraintClasses`?
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