localstack
diff --git a/‎src/ast/ddl.rs‎
Lines changed: 5 additions & 2 deletions b/‎src/ast/ddl.rs‎
Lines changed: 5 additions & 2 deletions
diff --git a/‎src/dialect/snowflake.rs‎
Lines changed: 5 additions & 3 deletions b/‎src/dialect/snowflake.rs‎
Lines changed: 5 additions & 3 deletions
@@ -1922,13 +1922,15 @@ impl fmt::Display for SemanticViewClause {
     }
 }
 
-/// The payload of a `CREATE [OR REPLACE] SEMANTIC VIEW` statement.
+/// The payload of a `CREATE [OR REPLACE | OR ALTER] SEMANTIC VIEW` statement.
 #[derive(Debug, Clone, PartialEq, PartialOrd, Eq, Ord, Hash)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 #[cfg_attr(feature = "visitor", derive(Visit, VisitMut))]
 pub struct CreateSemanticView {
     /// `OR REPLACE` flag.
     pub or_replace: bool,
+    /// `OR ALTER` flag.
+    pub or_alter: bool,
     /// `IF NOT EXISTS` flag.
     pub if_not_exists: bool,
     /// The semantic view name.
@@ -1957,8 +1959,9 @@ impl fmt::Display for CreateSemanticView {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         write!(
             f,
-            "CREATE {or_replace}SEMANTIC VIEW {if_not_exists}{name}",
+            "CREATE {or_replace}{or_alter}SEMANTIC VIEW {if_not_exists}{name}",
             or_replace = if self.or_replace { "OR REPLACE " } else { "" },
+            or_alter = if self.or_alter { "OR ALTER " } else { "" },
             if_not_exists = if self.if_not_exists { "IF NOT EXISTS " } else { "" },
             name = self.name,
         )?;
 
@@ -700,9 +700,9 @@ impl SnowflakeDialect {
                 return Some(parse_create_password_policy(or_replace, parser));
             }
 
-            // CREATE [OR REPLACE] SEMANTIC VIEW
+            // CREATE [OR REPLACE | OR ALTER] SEMANTIC VIEW
             if parser.parse_keywords(&[Keyword::SEMANTIC, Keyword::VIEW]) {
-                return Some(parse_create_semantic_view(or_replace, parser));
+                return Some(parse_create_semantic_view(or_replace, or_alter, parser));
             }
 
             // CREATE [OR REPLACE] SESSION POLICY
@@ -5561,12 +5561,13 @@ fn parse_semantic_view_expr(parser: &mut Parser, metric: bool) -> Result<Semanti
     })
 }
 
-/// Parse `CREATE [OR REPLACE] SEMANTIC VIEW [IF NOT EXISTS] <name>
+/// Parse `CREATE [OR REPLACE | OR ALTER] SEMANTIC VIEW [IF NOT EXISTS] <name>
 ///   TABLES ( ... ) [ RELATIONSHIPS ( ... ) ] [ FACTS ( ... ) ]
 ///   [ DIMENSIONS ( ... ) ] [ METRICS ( ... ) ] [ COMMENT = '...' ]`.
 /// The clauses are captured in declaration order (ADR 100 §1).
 fn parse_create_semantic_view(
     or_replace: bool,
+    or_alter: bool,
     parser: &mut Parser,
 ) -> Result<Statement, ParserError> {
     let if_not_exists = parser.parse_keywords(&[Keyword::IF, Keyword::NOT, Keyword::EXISTS]);
@@ -5637,6 +5638,7 @@ fn parse_create_semantic_view(
 
     Ok(Statement::CreateSemanticView(Box::new(CreateSemanticView {
         or_replace,
+        or_alter,
         if_not_exists,
         name,
         clauses,