Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/16067#discussion_r90154852
--- 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] =
--- End diff --
Can this infer `IsNotNull(a)`, `IsNotNull(b)` from `IsNotNull(a) &&
IsNotNull(b)`?
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