Github user lins05 commented on a diff in the pull request:
https://github.com/apache/spark/pull/15319#discussion_r82503891
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/QueryPlan.scala
---
@@ -74,14 +74,26 @@ 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 attribute used to
replace is an alias,
+ // because then both `QueryPlan.inferAdditionalConstraints` and
+ // `UnaryNode.getAliasedConstraints` applies and may produce a
non-converging set of
+ // constraints.
+ // For more details, infer
https://issues.apache.org/jira/browse/SPARK-17733
--- End diff --
typo "infer" -> "refer" (to)?
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