peter-toth commented on a change in pull request #27252: [SPARK-29231][SQL]
Constraints should be inferred from cast equality constraint
URL: https://github.com/apache/spark/pull/27252#discussion_r378315491
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/QueryPlanConstraints.scala
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@@ -62,11 +62,17 @@ trait ConstraintHelper {
*/
def inferAdditionalConstraints(constraints: Set[Expression]):
Set[Expression] = {
var inferredConstraints = Set.empty[Expression]
- constraints.foreach {
+ // IsNotNull should be constructed by `constructIsNotNullConstraints`.
+ val predicates = constraints.filterNot(_.isInstanceOf[IsNotNull])
+ predicates.foreach {
case eq @ EqualTo(l: Attribute, r: Attribute) =>
- val candidateConstraints = constraints - eq
+ val candidateConstraints = predicates - eq
inferredConstraints ++= replaceConstraints(candidateConstraints, l, r)
inferredConstraints ++= replaceConstraints(candidateConstraints, r, l)
+ case eq @ EqualTo(l @ Cast(_: Attribute, _, _), r: Attribute) =>
+ inferredConstraints ++= replaceConstraints(predicates - eq, r, l)
Review comment:
@wangyum I see, but I think currently you are doing something very different
in https://github.com/apache/spark/pull/27518 see details here:
https://github.com/apache/spark/pull/27518#issuecomment-585251432
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