Add support of FREEZE|UNFREEZE PARTITION syntax for ClickHouse

src/ast/ddl.rs

@@ -87,6 +87,20 @@ pub enum AlterTableOperation {
         // See `AttachPartition` for more details
         partition: Partition,
     },
+    /// `FREEZE PARTITION <partition_expr>`
+    /// Note: this is a ClickHouse-specific operation, please refer to
+    /// [ClickHouse](https://clickhouse.com/docs/en/sql-reference/statements/alter/partition#freeze-partition)
+    FreezePartition {
+        partition: Partition,
+        with_name: Option<Ident>,
+    },
+    /// `UNFREEZE PARTITION <partition_expr>`
+    /// Note: this is a ClickHouse-specific operation, please refer to
+    /// [ClickHouse](https://clickhouse.com/docs/en/sql-reference/statements/alter/partition#unfreeze-partition)
+    UnfreezePartition {
+        partition: Partition,
+        with_name: Option<Ident>,
+    },
     /// `DROP PRIMARY KEY`
     ///
     /// Note: this is a MySQL-specific operation.
@@ -379,6 +393,26 @@ impl fmt::Display for AlterTableOperation {
                     display_comma_separated(table_properties)
                 )
             }
+            AlterTableOperation::FreezePartition {
+                partition,
+                with_name,
+            } => {
+                write!(f, "FREEZE {partition}")?;
+                if let Some(name) = with_name {
+                    write!(f, " WITH NAME {name}")?;
+                }
+                Ok(())
+            }
+            AlterTableOperation::UnfreezePartition {
+                partition,
+                with_name,
+            } => {
+                write!(f, "UNFREEZE {partition}")?;
+                if let Some(name) = with_name {
+                    write!(f, " WITH NAME {name}")?;
+                }
+                Ok(())
+            }
         }
     }
 }

src/keywords.rs

@@ -760,6 +760,7 @@ define_keywords!(
     UNBOUNDED,
     UNCACHE,
     UNCOMMITTED,
+    UNFREEZE,
     UNION,
     UNIQUE,
     UNKNOWN,

src/parser/mod.rs

@@ -6479,6 +6479,34 @@ impl<'a> Parser<'a> {
             AlterTableOperation::DetachPartition {
                 partition: self.parse_part_or_partition()?,
             }
+        } else if dialect_of!(self is ClickHouseDialect|GenericDialect)
+            && self.parse_keyword(Keyword::FREEZE)
+        {
+            let partition = self.parse_part_or_partition()?;
+            let with_name = if self.parse_keyword(Keyword::WITH) {
+                self.expect_keyword(Keyword::NAME)?;
+                Some(self.parse_identifier(false)?)
+            } else {
+                None
+            };
+            AlterTableOperation::FreezePartition {
+                partition,
+                with_name,
+            }
+        } else if dialect_of!(self is ClickHouseDialect|GenericDialect)
+            && self.parse_keyword(Keyword::UNFREEZE)
+        {
+            let partition = self.parse_part_or_partition()?;
+            let with_name = if self.parse_keyword(Keyword::WITH) {
+                self.expect_keyword(Keyword::NAME)?;
+                Some(self.parse_identifier(false)?)
+            } else {
+                None
+            };
+            AlterTableOperation::UnfreezePartition {
+                partition,
+                with_name,
+            }
         } else {
             let options: Vec<SqlOption> =
                 self.parse_options_with_keywords(&[Keyword::SET, Keyword::TBLPROPERTIES])?;

tests/sqlparser_clickhouse.rs

@@ -1216,6 +1216,89 @@ fn parse_create_table_on_commit_and_as_query() {
     }
 }
 
+#[test]
+fn parse_freeze_and_unfreeze_partition() {
+    // test cases without `WITH NAME`
+    for operation_name in &["FREEZE", "UNFREEZE"] {
+        let sql = format!("ALTER TABLE t {operation_name} PARTITION '2024-08-14'");
+
+        let expected_partition = Partition::Expr(Expr::Value(Value::SingleQuotedString(
+            "2024-08-14".to_string(),
+        )));
+        match clickhouse_and_generic().verified_stmt(&sql) {
+            Statement::AlterTable { operations, .. } => {
+                assert_eq!(operations.len(), 1);
+                let expected_operation = if operation_name == &"FREEZE" {
+                    AlterTableOperation::FreezePartition {
+                        partition: expected_partition,
+                        with_name: None,
+                    }
+                } else {
+                    AlterTableOperation::UnfreezePartition {
+                        partition: expected_partition,
+                        with_name: None,
+                    }
+                };
+                assert_eq!(operations[0], expected_operation);
+            }
+            _ => unreachable!(),
+        }
+    }
+
+    // test case with `WITH NAME`
+    for operation_name in &["FREEZE", "UNFREEZE"] {
+        let sql =
+            format!("ALTER TABLE t {operation_name} PARTITION '2024-08-14' WITH NAME 'hello'");
+        match clickhouse_and_generic().verified_stmt(&sql) {
+            Statement::AlterTable { operations, .. } => {
+                assert_eq!(operations.len(), 1);
+                let expected_partition = Partition::Expr(Expr::Value(Value::SingleQuotedString(
+                    "2024-08-14".to_string(),
+                )));
+                let expected_operation = if operation_name == &"FREEZE" {
+                    AlterTableOperation::FreezePartition {
+                        partition: expected_partition,
+                        with_name: Some(Ident::with_quote('\'', "hello")),
+                    }
+                } else {
+                    AlterTableOperation::UnfreezePartition {
+                        partition: expected_partition,
+                        with_name: Some(Ident::with_quote('\'', "hello")),
+                    }
+                };
+                assert_eq!(operations[0], expected_operation);
+            }
+            _ => unreachable!(),
+        }
+    }
+
+    // negative cases
+    for operation_name in &["FREEZE", "UNFREEZE"] {
+        assert_eq!(
+            clickhouse_and_generic()
+                .parse_sql_statements(format!("ALTER TABLE t0 {operation_name} PARTITION").as_str())
+                .unwrap_err(),
+            ParserError("Expected: an expression:, found: EOF".to_string())
+        );
+        assert_eq!(
+            clickhouse_and_generic()
+                .parse_sql_statements(
+                    format!("ALTER TABLE t0 {operation_name} PARTITION p0 WITH").as_str()
+                )
+                .unwrap_err(),
+            ParserError("Expected: NAME, found: EOF".to_string())
+        );
+        assert_eq!(
+            clickhouse_and_generic()
+                .parse_sql_statements(
+                    format!("ALTER TABLE t0 {operation_name} PARTITION p0 WITH NAME").as_str()
+                )
+                .unwrap_err(),
+            ParserError("Expected: identifier, found: EOF".to_string())
+        );
+    }
+}
+
 #[test]
 fn parse_select_table_function_settings() {
     fn check_settings(sql: &str, expected: &TableFunctionArgs) {