Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/16067#discussion_r90176972 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/QueryPlan.scala --- @@ -58,13 +57,28 @@ abstract class QueryPlan[PlanType <: QueryPlan[PlanType]] extends TreeNode[PlanT } /** + * Infer the Attribute-specific IsNotNull constraints from the null intolerant child expressions + * of constraints. + */ + private def inferIsNotNullConstraints(constraint: Expression): Seq[Expression] = + constraint match { + case IsNotNull(_: Attribute) => constraint :: Nil + // When the root is IsNotNull, we can push IsNotNull through the child null intolerant + // expressions + case IsNotNull(expr) => scanNullIntolerantExpr(expr).map(IsNotNull(_)) + // Constraints always return true for all the inputs. That means, null will never be returned. + // Thus, we can infer `IsNotNull(constraint)`, and also push IsNotNull through the child + // null intolerant expressions. + case _ => scanNullIntolerantExpr(constraint).map(IsNotNull(_)) + } + + /** * Recursively explores the expressions which are null intolerant and returns all attributes * in these expressions. */ private def scanNullIntolerantExpr(expr: Expression): Seq[Attribute] = expr match { --- End diff -- shall we rename it to `scanNullIntolerantAttribute`?
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