Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17568#discussion_r111884257
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala
---
@@ -368,6 +369,8 @@ case class NullPropagation(conf: SQLConf) extends
Rule[LogicalPlan] {
case EqualNullSafe(Literal(null, _), r) => IsNull(r)
case EqualNullSafe(l, Literal(null, _)) => IsNull(l)
+ case AssertNotNull(c, _) if !c.nullable => c
--- End diff --
as long as we trust the `nullable` property, I think it's safe to remove
it. We don't use `AssertNull` to validate the input data.
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