allisonwang-db commented on code in PR #38660:
URL: https://github.com/apache/spark/pull/38660#discussion_r1038557594
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala:
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@@ -117,6 +117,7 @@ abstract class Expression extends TreeNode[Expression] {
lazy val deterministic: Boolean = children.forall(_.deterministic)
def nullable: Boolean
+ def trustNullability: Boolean = true
Review Comment:
I might be missing some context but why do we need a new field
`trustNullability`? Can't we simply use `nullable` and maybe add a flag to
enforce the nullability of UDFs?
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