Add "DROP TYPE" support. (#1461)

src/ast/mod.rs

@@ -5736,6 +5736,7 @@ pub enum ObjectType {
     Role,
     Sequence,
     Stage,
+    Type,
 }
 
 impl fmt::Display for ObjectType {
@@ -5749,6 +5750,7 @@ impl fmt::Display for ObjectType {
             ObjectType::Role => "ROLE",
             ObjectType::Sequence => "SEQUENCE",
             ObjectType::Stage => "STAGE",
+            ObjectType::Type => "TYPE",
         })
     }
 }

src/parser/mod.rs

@@ -4889,6 +4889,8 @@ impl<'a> Parser<'a> {
             ObjectType::Sequence
         } else if self.parse_keyword(Keyword::STAGE) {
             ObjectType::Stage
+        } else if self.parse_keyword(Keyword::TYPE) {
+            ObjectType::Type
         } else if self.parse_keyword(Keyword::FUNCTION) {
             return self.parse_drop_function();
         } else if self.parse_keyword(Keyword::POLICY) {
@@ -4901,7 +4903,7 @@ impl<'a> Parser<'a> {
             return self.parse_drop_trigger();
         } else {
             return self.expected(
-                "TABLE, VIEW, INDEX, ROLE, SCHEMA, DATABASE, FUNCTION, PROCEDURE, STAGE, TRIGGER, SECRET or SEQUENCE after DROP",
+                "TABLE, VIEW, INDEX, ROLE, SCHEMA, DATABASE, FUNCTION, PROCEDURE, STAGE, TRIGGER, SECRET, SEQUENCE, or TYPE after DROP",
                 self.peek_token(),
             );
         };

tests/sqlparser_common.rs

@@ -9690,6 +9690,60 @@ fn parse_create_type() {
     );
 }
 
+#[test]
+fn parse_drop_type() {
+    let sql = "DROP TYPE abc";
+    match verified_stmt(sql) {
+        Statement::Drop {
+            names,
+            object_type,
+            if_exists,
+            cascade,
+            ..
+        } => {
+            assert_eq_vec(&["abc"], &names);
+            assert_eq!(ObjectType::Type, object_type);
+            assert!(!if_exists);
+            assert!(!cascade);
+        }
+        _ => unreachable!(),
+    };
+
+    let sql = "DROP TYPE IF EXISTS def, magician, quaternion";
+    match verified_stmt(sql) {
+        Statement::Drop {
+            names,
+            object_type,
+            if_exists,
+            cascade,
+            ..
+        } => {
+            assert_eq_vec(&["def", "magician", "quaternion"], &names);
+            assert_eq!(ObjectType::Type, object_type);
+            assert!(if_exists);
+            assert!(!cascade);
+        }
+        _ => unreachable!(),
+    }
+
+    let sql = "DROP TYPE IF EXISTS my_type CASCADE";
+    match verified_stmt(sql) {
+        Statement::Drop {
+            names,
+            object_type,
+            if_exists,
+            cascade,
+            ..
+        } => {
+            assert_eq_vec(&["my_type"], &names);
+            assert_eq!(ObjectType::Type, object_type);
+            assert!(if_exists);
+            assert!(cascade);
+        }
+        _ => unreachable!(),
+    }
+}
+
 #[test]
 fn parse_call() {
     all_dialects().verified_stmt("CALL my_procedure()");