Change on_cluster type from Option<String> to Option<Ident>

src/ast/dml.rs

@@ -126,7 +126,7 @@ pub struct CreateTable {
     pub on_commit: Option<OnCommit>,
     /// ClickHouse "ON CLUSTER" clause:
     /// <https://clickhouse.com/docs/en/sql-reference/distributed-ddl/>
-    pub on_cluster: Option<String>,
+    pub on_cluster: Option<Ident>,
     /// ClickHouse "PRIMARY KEY " clause.
     /// <https://clickhouse.com/docs/en/sql-reference/statements/create/table/>
     pub primary_key: Option<Box<Expr>>,

src/ast/helpers/stmt_create_table.rs

@@ -73,7 +73,7 @@ pub struct CreateTableBuilder {
     pub default_charset: Option<String>,
     pub collation: Option<String>,
     pub on_commit: Option<OnCommit>,
-    pub on_cluster: Option<String>,
+    pub on_cluster: Option<Ident>,
     pub primary_key: Option<Box<Expr>>,
     pub order_by: Option<OneOrManyWithParens<Expr>>,
     pub partition_by: Option<Box<Expr>>,
@@ -261,7 +261,7 @@ impl CreateTableBuilder {
         self
     }
 
-    pub fn on_cluster(mut self, on_cluster: Option<String>) -> Self {
+    pub fn on_cluster(mut self, on_cluster: Option<Ident>) -> Self {
         self.on_cluster = on_cluster;
         self
     }

src/ast/mod.rs

@@ -2165,7 +2165,7 @@ pub enum Statement {
         /// ClickHouse dialect supports `ON CLUSTER` clause for ALTER TABLE
         /// For example: `ALTER TABLE table_name ON CLUSTER cluster_name ADD COLUMN c UInt32`
         /// [ClickHouse](https://clickhouse.com/docs/en/sql-reference/statements/alter/update)
-        on_cluster: Option<String>,
+        on_cluster: Option<Ident>,
     },
     /// ```sql
     /// ALTER INDEX

src/parser/mod.rs

@@ -5372,14 +5372,9 @@ impl<'a> Parser<'a> {
         }
     }
 
-    fn parse_optional_on_cluster(&mut self) -> Result<Option<String>, ParserError> {
+    fn parse_optional_on_cluster(&mut self) -> Result<Option<Ident>, ParserError> {
         if self.parse_keywords(&[Keyword::ON, Keyword::CLUSTER]) {
-            let next_token = self.next_token();
-            match next_token.token {
-                Token::SingleQuotedString(s) => Ok(Some(format!("'{}'", s))),
-                Token::Word(s) => Ok(Some(s.to_string())),
-                _ => self.expected("identifier or cluster literal", next_token)?,
-            }
+            Ok(Some(self.parse_identifier(false)?))
         } else {
             Ok(None)
         }

tests/sqlparser_common.rs

@@ -3506,7 +3506,7 @@ fn parse_create_table_on_cluster() {
     let sql = "CREATE TABLE t ON CLUSTER '{cluster}' (a INT, b INT)";
     match generic.verified_stmt(sql) {
         Statement::CreateTable(CreateTable { on_cluster, .. }) => {
-            assert_eq!(on_cluster.unwrap(), "'{cluster}'".to_string());
+            assert_eq!(on_cluster.unwrap().to_string(), "'{cluster}'".to_string());
         }
         _ => unreachable!(),
     }
@@ -3515,7 +3515,7 @@ fn parse_create_table_on_cluster() {
     let sql = "CREATE TABLE t ON CLUSTER my_cluster (a INT, b INT)";
     match generic.verified_stmt(sql) {
         Statement::CreateTable(CreateTable { on_cluster, .. }) => {
-            assert_eq!(on_cluster.unwrap(), "my_cluster".to_string());
+            assert_eq!(on_cluster.unwrap().to_string(), "my_cluster".to_string());
         }
         _ => unreachable!(),
     }
@@ -3824,13 +3824,26 @@ fn parse_alter_table() {
 
 #[test]
 fn test_alter_table_with_on_cluster() {
-    let sql = "ALTER TABLE t ON CLUSTER 'cluster' ADD CONSTRAINT bar PRIMARY KEY (baz)";
-    match all_dialects().verified_stmt(sql) {
+    match all_dialects()
+        .verified_stmt("ALTER TABLE t ON CLUSTER 'cluster' ADD CONSTRAINT bar PRIMARY KEY (baz)")
+    {
+        Statement::AlterTable {
+            name, on_cluster, ..
+        } => {
+            std::assert_eq!(name.to_string(), "t");
+            std::assert_eq!(on_cluster, Some(Ident::with_quote('\'', "cluster")));
+        }
+        _ => unreachable!(),
+    }
+
+    match all_dialects()
+        .verified_stmt("ALTER TABLE t ON CLUSTER cluster_name ADD CONSTRAINT bar PRIMARY KEY (baz)")
+    {
         Statement::AlterTable {
             name, on_cluster, ..
         } => {
             std::assert_eq!(name.to_string(), "t");
-            std::assert_eq!(on_cluster, Some("'cluster'".to_string()));
+            std::assert_eq!(on_cluster, Some(Ident::new("cluster_name")));
         }
         _ => unreachable!(),
     }
@@ -3839,7 +3852,7 @@ fn test_alter_table_with_on_cluster() {
         .parse_sql_statements("ALTER TABLE t ON CLUSTER 123 ADD CONSTRAINT bar PRIMARY KEY (baz)");
     std::assert_eq!(
         res.unwrap_err(),
-        ParserError::ParserError("Expected: identifier or cluster literal, found: 123".to_string())
+        ParserError::ParserError("Expected: identifier, found: 123".to_string())
     )
 }