Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17568#discussion_r111521892
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/objects.scala
---
@@ -96,3 +99,40 @@ object CombineTypedFilters extends Rule[LogicalPlan] {
}
}
}
+
+/**
+ * Removes MapObjects when the following conditions are satisfied
+ * 1. Mapobject(e) where e is lambdavariable
+ * 2. the function will convert an expression MapObjects(e) to
AssertNotNull(e)
--- End diff --
If we have `AssertNotNull`, then it's not a no-op and we can not eliminate
this `MapObjects`. We may need to update `NullPropagation` to eliminate no-op
`AssertNotNull`
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