Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/18576#discussion_r178411933
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -1309,3 +1311,20 @@ object RemoveRepetitionFromGroupExpressions extends
Rule[LogicalPlan] {
}
}
}
+
+/**
+ * Updates nullability in [[AttributeReference]]s if nullability is
different between
+ * non-leaf plan's expressions and the children output.
+ */
+object UpdateNullabilityInAttributeReferences extends Rule[LogicalPlan] {
--- End diff --
ok, I'll drop it in this pr. just a sec.
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