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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