Added another missing copy derive

Author: LucaCappelletti94

src/ast/ddl.rs

@@ -5177,7 +5177,7 @@ impl fmt::Display for CreatePolicy {
 /// AS [ PERMISSIVE | RESTRICTIVE ]
 /// ```
 /// [PostgreSQL](https://www.postgresql.org/docs/current/sql-createpolicy.html)
-#[derive(Debug, Clone, PartialEq, PartialOrd, Eq, Ord, Hash)]
+#[derive(Debug, Clone, Copy, PartialEq, PartialOrd, Eq, Ord, Hash)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 #[cfg_attr(feature = "visitor", derive(Visit, VisitMut))]
 pub enum CreatePolicyType {