support DROP VIEW statement (goccy#128)

README.md

@@ -249,7 +249,7 @@ A list of ZetaSQL ( Google Standard SQL ) specifications and features supported
 - [x] DROP TABLE
 - [ ] DROP SNAPSHOT TABLE
 - [ ] DROP EXTERNAL TABLE
-- [ ] DROP VIEW
+- [x] DROP VIEW
 - [ ] DROP MATERIALIZED VIEW
 - [x] DROP FUNCTION
 - [ ] DROP TABLE FUNCTION

exec_test.go

@@ -71,6 +71,18 @@ INSERT recreate_table (b) VALUES ('hello');
 CREATE OR REPLACE TABLE TableA(product string, quantity int64);
 INSERT TableA (product, quantity) SELECT 'top load washer', 10;
 INSERT INTO TableA (product, quantity) SELECT * FROM UNNEST([('microwave', 20), ('dishwasher', 30)]);
+`,
+		},
+		{
+			name: "create view",
+			query: `
+CREATE VIEW _view_a AS SELECT * FROM TableA
+`,
+		},
+		{
+			name: "drop view",
+			query: `
+DROP VIEW IF EXISTS _view_a
 `,
 		},
 		{

internal/formatter.go

@@ -1344,10 +1344,11 @@ func (n *DropStmtNode) FormatSQL(ctx context.Context) (string, error) {
 	}
 	namePath := namePathFromContext(ctx)
 	tableName := namePath.format(n.node.NamePath())
+	objectType := n.node.ObjectType()
 	if n.node.IsIfExists() {
-		return fmt.Sprintf("DROP TABLE IF EXISTS `%s`", tableName), nil
+		return fmt.Sprintf("DROP %s IF EXISTS `%s`", objectType, tableName), nil
 	}
-	return fmt.Sprintf("DROP TABLE `%s`", tableName), nil
+	return fmt.Sprintf("DROP %s `%s`", objectType, tableName), nil
 }
 
 func (n *DropMaterializedViewStmtNode) FormatSQL(ctx context.Context) (string, error) {

internal/stmt_action.go

@@ -258,7 +258,7 @@ type DropStmtAction struct {
 
 func (a *DropStmtAction) exec(ctx context.Context, conn *Conn) error {
 	switch a.objectType {
-	case "TABLE":
+	case "TABLE", "VIEW":
 		if _, err := conn.ExecContext(ctx, a.formattedQuery, a.args...); err != nil {
 			return fmt.Errorf("failed to exec %s: %w", a.query, err)
 		}