feat: support different USE statement syntaxes

src/ast/dcl.rs

@@ -193,3 +193,30 @@ impl fmt::Display for AlterRoleOperation {
         }
     }
 }
+
+/// A `USE` (`Statement::Use`) operation
+#[derive(Debug, Clone, PartialEq, PartialOrd, Eq, Ord, Hash)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
+#[cfg_attr(feature = "visitor", derive(Visit, VisitMut))]
+pub enum Use {
+    Catalog(ObjectName),   // e.g. `USE CATALOG foo.bar`
+    Schema(ObjectName),    // e.g. `USE SCHEMA foo.bar`
+    Database(ObjectName),  // e.g. `USE DATABASE foo.bar`
+    Warehouse(ObjectName), // e.g. `USE WAREHOUSE foo.bar`
+    Object(ObjectName),    // e.g. `USE foo.bar`
+    Default,               // e.g. `USE DEFAULT`
+}
+
+impl fmt::Display for Use {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.write_str("USE ")?;
+        match self {
+            Use::Catalog(name) => write!(f, "CATALOG {}", name),
+            Use::Schema(name) => write!(f, "SCHEMA {}", name),
+            Use::Database(name) => write!(f, "DATABASE {}", name),
+            Use::Warehouse(name) => write!(f, "WAREHOUSE {}", name),
+            Use::Object(name) => write!(f, "{}", name),
+            Use::Default => write!(f, "DEFAULT"),
+        }
+    }
+}

src/ast/mod.rs

@@ -31,7 +31,7 @@ pub use self::data_type::{
     ArrayElemTypeDef, CharLengthUnits, CharacterLength, DataType, ExactNumberInfo,
     StructBracketKind, TimezoneInfo,
 };
-pub use self::dcl::{AlterRoleOperation, ResetConfig, RoleOption, SetConfigValue};
+pub use self::dcl::{AlterRoleOperation, ResetConfig, RoleOption, SetConfigValue, Use};
 pub use self::ddl::{
     AlterColumnOperation, AlterIndexOperation, AlterTableOperation, ColumnDef, ColumnOption,
     ColumnOptionDef, ConstraintCharacteristics, Deduplicate, DeferrableInitial, GeneratedAs,
@@ -2515,11 +2515,9 @@ pub enum Statement {
     /// Note: this is a MySQL-specific statement.
     ShowCollation { filter: Option<ShowStatementFilter> },
     /// ```sql
-    /// USE
+    /// `USE ...`
     /// ```
-    ///
-    /// Note: This is a MySQL-specific statement.
-    Use { db_name: Ident },
+    Use(Use),
     /// ```sql
     /// START  [ TRANSACTION | WORK ] | START TRANSACTION } ...
     /// ```
@@ -4125,10 +4123,7 @@ impl fmt::Display for Statement {
                 }
                 Ok(())
             }
-            Statement::Use { db_name } => {
-                write!(f, "USE {db_name}")?;
-                Ok(())
-            }
+            Statement::Use(use_expr) => use_expr.fmt(f),
             Statement::ShowCollation { filter } => {
                 write!(f, "SHOW COLLATION")?;
                 if let Some(filter) = filter {

src/keywords.rs

@@ -137,6 +137,7 @@ define_keywords!(
     CASCADED,
     CASE,
     CAST,
+    CATALOG,
     CEIL,
     CEILING,
     CENTURY,
@@ -803,6 +804,7 @@ define_keywords!(
     VIEW,
     VIRTUAL,
     VOLATILE,
+    WAREHOUSE,
     WEEK,
     WHEN,
     WHENEVER,

src/parser/mod.rs

@@ -9225,8 +9225,31 @@ impl<'a> Parser<'a> {
     }
 
     pub fn parse_use(&mut self) -> Result<Statement, ParserError> {
-        let db_name = self.parse_identifier(false)?;
-        Ok(Statement::Use { db_name })
+        // Determine which keywords are recognized by the current dialect
+        let parsed_keyword = if dialect_of!(self is HiveDialect) {
+            // HiveDialect accepts USE DEFAULT; statement without any db specified
+            if self.parse_keyword(Keyword::DEFAULT) {
+                return Ok(Statement::Use(Use::Default));
+            }
+            None // HiveDialect doesn't expect any other specific keyword after `USE`
+        } else if dialect_of!(self is DatabricksDialect) {
+            self.parse_one_of_keywords(&[Keyword::CATALOG, Keyword::DATABASE, Keyword::SCHEMA])
+        } else if dialect_of!(self is SnowflakeDialect) {
+            self.parse_one_of_keywords(&[Keyword::DATABASE, Keyword::SCHEMA, Keyword::WAREHOUSE])
+        } else {
+            None // No specific keywords for other dialects, including GenericDialect
+        };
+
+        let obj_name = self.parse_object_name(false)?;
+        let result = match parsed_keyword {
+            Some(Keyword::CATALOG) => Use::Catalog(obj_name),
+            Some(Keyword::DATABASE) => Use::Database(obj_name),
+            Some(Keyword::SCHEMA) => Use::Schema(obj_name),
+            Some(Keyword::WAREHOUSE) => Use::Warehouse(obj_name),
+            _ => Use::Object(obj_name),
+        };
+
+        Ok(Statement::Use(result))
     }
 
     pub fn parse_table_and_joins(&mut self) -> Result<TableWithJoins, ParserError> {

tests/sqlparser_clickhouse.rs

@@ -1160,6 +1160,39 @@ fn test_prewhere() {
     }
 }
 
+#[test]
+fn parse_use() {
+    let valid_object_names = [
+        "mydb",
+        "SCHEMA",
+        "DATABASE",
+        "CATALOG",
+        "WAREHOUSE",
+        "DEFAULT",
+    ];
+    let quote_styles = ['"', '`'];
+
+    for object_name in &valid_object_names {
+        // Test single identifier without quotes
+        assert_eq!(
+            clickhouse().verified_stmt(&format!("USE {}", object_name)),
+            Statement::Use(Use::Object(ObjectName(vec![Ident::new(
+                object_name.to_string()
+            )])))
+        );
+        for &quote in &quote_styles {
+            // Test single identifier with different type of quotes
+            assert_eq!(
+                clickhouse().verified_stmt(&format!("USE {0}{1}{0}", quote, object_name)),
+                Statement::Use(Use::Object(ObjectName(vec![Ident::with_quote(
+                    quote,
+                    object_name.to_string(),
+                )])))
+            );
+        }
+    }
+}
+
 #[test]
 fn test_query_with_format_clause() {
     let format_options = vec!["TabSeparated", "JSONCompact", "NULL"];

tests/sqlparser_databricks.rs

@@ -189,3 +189,77 @@ fn test_values_clause() {
     // TODO: support this example from https://docs.databricks.com/en/sql/language-manual/sql-ref-syntax-qry-select-values.html#examples
     // databricks().verified_query("VALUES 1, 2, 3");
 }
+
+#[test]
+fn parse_use() {
+    let valid_object_names = ["mydb", "WAREHOUSE", "DEFAULT"];
+    let quote_styles = ['"', '`'];
+
+    for object_name in &valid_object_names {
+        // Test single identifier without quotes
+        assert_eq!(
+            databricks().verified_stmt(&format!("USE {}", object_name)),
+            Statement::Use(Use::Object(ObjectName(vec![Ident::new(
+                object_name.to_string()
+            )])))
+        );
+        for &quote in &quote_styles {
+            // Test single identifier with different type of quotes
+            assert_eq!(
+                databricks().verified_stmt(&format!("USE {0}{1}{0}", quote, object_name)),
+                Statement::Use(Use::Object(ObjectName(vec![Ident::with_quote(
+                    quote,
+                    object_name.to_string(),
+                )])))
+            );
+        }
+    }
+
+    for &quote in &quote_styles {
+        // Test single identifier with keyword and different type of quotes
+        assert_eq!(
+            databricks().verified_stmt(&format!("USE CATALOG {0}my_catalog{0}", quote)),
+            Statement::Use(Use::Catalog(ObjectName(vec![Ident::with_quote(
+                quote,
+                "my_catalog".to_string(),
+            )])))
+        );
+        assert_eq!(
+            databricks().verified_stmt(&format!("USE DATABASE {0}my_database{0}", quote)),
+            Statement::Use(Use::Database(ObjectName(vec![Ident::with_quote(
+                quote,
+                "my_database".to_string(),
+            )])))
+        );
+        assert_eq!(
+            databricks().verified_stmt(&format!("USE SCHEMA {0}my_schema{0}", quote)),
+            Statement::Use(Use::Schema(ObjectName(vec![Ident::with_quote(
+                quote,
+                "my_schema".to_string(),
+            )])))
+        );
+    }
+
+    // Test single identifier with keyword and no quotes
+    assert_eq!(
+        databricks().verified_stmt("USE CATALOG my_catalog"),
+        Statement::Use(Use::Catalog(ObjectName(vec![Ident::new("my_catalog")])))
+    );
+    assert_eq!(
+        databricks().verified_stmt("USE DATABASE my_schema"),
+        Statement::Use(Use::Database(ObjectName(vec![Ident::new("my_schema")])))
+    );
+    assert_eq!(
+        databricks().verified_stmt("USE SCHEMA my_schema"),
+        Statement::Use(Use::Schema(ObjectName(vec![Ident::new("my_schema")])))
+    );
+
+    // Test invalid syntax - missing identifier
+    let invalid_cases = ["USE SCHEMA", "USE DATABASE", "USE CATALOG"];
+    for sql in &invalid_cases {
+        assert_eq!(
+            databricks().parse_sql_statements(sql).unwrap_err(),
+            ParserError::ParserError("Expected: identifier, found: EOF".to_string()),
+        );
+    }
+}

tests/sqlparser_duckdb.rs

@@ -756,3 +756,55 @@ fn test_duckdb_union_datatype() {
         stmt
     );
 }
+
+#[test]
+fn parse_use() {
+    let valid_object_names = [
+        "mydb",
+        "SCHEMA",
+        "DATABASE",
+        "CATALOG",
+        "WAREHOUSE",
+        "DEFAULT",
+    ];
+    let quote_styles = ['"', '\''];
+
+    for object_name in &valid_object_names {
+        // Test single identifier without quotes
+        assert_eq!(
+            duckdb().verified_stmt(&format!("USE {}", object_name)),
+            Statement::Use(Use::Object(ObjectName(vec![Ident::new(
+                object_name.to_string()
+            )])))
+        );
+        for &quote in &quote_styles {
+            // Test single identifier with different type of quotes
+            assert_eq!(
+                duckdb().verified_stmt(&format!("USE {0}{1}{0}", quote, object_name)),
+                Statement::Use(Use::Object(ObjectName(vec![Ident::with_quote(
+                    quote,
+                    object_name.to_string(),
+                )])))
+            );
+        }
+    }
+
+    for &quote in &quote_styles {
+        // Test double identifier with different type of quotes
+        assert_eq!(
+            duckdb().verified_stmt(&format!("USE {0}CATALOG{0}.{0}my_schema{0}", quote)),
+            Statement::Use(Use::Object(ObjectName(vec![
+                Ident::with_quote(quote, "CATALOG"),
+                Ident::with_quote(quote, "my_schema")
+            ])))
+        );
+    }
+    // Test double identifier without quotes
+    assert_eq!(
+        duckdb().verified_stmt("USE mydb.my_schema"),
+        Statement::Use(Use::Object(ObjectName(vec![
+            Ident::new("mydb"),
+            Ident::new("my_schema")
+        ])))
+    );
+}

tests/sqlparser_hive.rs

@@ -18,7 +18,7 @@
 use sqlparser::ast::{
     CreateFunctionBody, CreateFunctionUsing, Expr, Function, FunctionArgumentList,
     FunctionArguments, Ident, ObjectName, OneOrManyWithParens, SelectItem, Statement, TableFactor,
-    UnaryOperator, Value,
+    UnaryOperator, Use, Value,
 };
 use sqlparser::dialect::{GenericDialect, HiveDialect, MsSqlDialect};
 use sqlparser::parser::ParserError;
@@ -401,6 +401,36 @@ fn parse_delimited_identifiers() {
     //TODO verified_stmt(r#"UPDATE foo SET "bar" = 5"#);
 }
 
+#[test]
+fn parse_use() {
+    let valid_object_names = ["mydb", "SCHEMA", "DATABASE", "CATALOG", "WAREHOUSE"];
+    let quote_styles = ['\'', '"', '`'];
+    for object_name in &valid_object_names {
+        // Test single identifier without quotes
+        assert_eq!(
+            hive().verified_stmt(&format!("USE {}", object_name)),
+            Statement::Use(Use::Object(ObjectName(vec![Ident::new(
+                object_name.to_string()
+            )])))
+        );
+        for &quote in &quote_styles {
+            // Test single identifier with different type of quotes
+            assert_eq!(
+                hive().verified_stmt(&format!("USE {}{}{}", quote, object_name, quote)),
+                Statement::Use(Use::Object(ObjectName(vec![Ident::with_quote(
+                    quote,
+                    object_name.to_string(),
+                )])))
+            );
+        }
+    }
+    // Test DEFAULT keyword that is special case in Hive
+    assert_eq!(
+        hive().verified_stmt("USE DEFAULT"),
+        Statement::Use(Use::Default)
+    );
+}
+
 fn hive() -> TestedDialects {
     TestedDialects {
         dialects: vec![Box::new(HiveDialect {})],

tests/sqlparser_mssql.rs

@@ -621,6 +621,38 @@ fn parse_mssql_declare() {
     );
 }
 
+#[test]
+fn parse_use() {
+    let valid_object_names = [
+        "mydb",
+        "SCHEMA",
+        "DATABASE",
+        "CATALOG",
+        "WAREHOUSE",
+        "DEFAULT",
+    ];
+    let quote_styles = ['\'', '"'];
+    for object_name in &valid_object_names {
+        // Test single identifier without quotes
+        assert_eq!(
+            ms().verified_stmt(&format!("USE {}", object_name)),
+            Statement::Use(Use::Object(ObjectName(vec![Ident::new(
+                object_name.to_string()
+            )])))
+        );
+        for &quote in &quote_styles {
+            // Test single identifier with different type of quotes
+            assert_eq!(
+                ms().verified_stmt(&format!("USE {}{}{}", quote, object_name, quote)),
+                Statement::Use(Use::Object(ObjectName(vec![Ident::with_quote(
+                    quote,
+                    object_name.to_string(),
+                )])))
+            );
+        }
+    }
+}
+
 fn ms() -> TestedDialects {
     TestedDialects {
         dialects: vec![Box::new(MsSqlDialect {})],