Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/20750#discussion_r174605126
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
---
@@ -328,6 +328,21 @@ trait Nondeterministic extends Expression {
protected def evalInternal(input: InternalRow): Any
}
+/**
+ * A stateful nondeterministic expression. These expressions contain state
+ * that is not stored in the parameter list.
+ */
+trait StatefulNondeterministic extends Nondeterministic {
--- End diff --
Maybe we can just call it `Stateful` while still extending
`Nondeterministic`, and in the doc we say that stateful expressions imply it's
nondeterministic.
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