wangyum commented on a change in pull request #27632: [WIP][SPARK-30872][SQL]
Constraints inferred from inferred attributes
URL: https://github.com/apache/spark/pull/27632#discussion_r381892261
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/QueryPlanConstraints.scala
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@@ -75,7 +85,7 @@ trait ConstraintHelper {
inferredConstraints ++= replaceConstraints(predicates - eq, l, r)
case _ => // No inference
}
- inferredConstraints -- constraints
+ (inferredConstraints -- constraints).filterNot(i =>
constraints.exists(_.semanticEquals(i)))
Review comment:
If the `constraint` contains `a = b`. This change is to filter out `b = a`.
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