Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/18576#discussion_r136210112
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala
---
@@ -120,7 +120,25 @@ case class Generate(
case class Filter(condition: Expression, child: LogicalPlan)
extends UnaryNode with PredicateHelper {
- override def output: Seq[Attribute] = child.output
+
+ // The columns that will filtered out by `IsNotNull` could be considered
as not nullable.
+ private lazy val notNullAttributes =
splitConjunctivePredicates(condition).flatMap {
--- End diff --
IIUC `condition` has all the `constrains` in this node?
`InferFiltersFromConstraints` updates `condition` based on `constrains`.
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