Support use clause.Interface as query params

statement.go

@@ -179,6 +179,10 @@ func (stmt *Statement) AddVar(writer clause.Writer, vars ...interface{}) {
 			} else {
 				stmt.AddVar(writer, v.GormValue(stmt.Context, stmt.DB))
 			}
+		case clause.Interface:
+			c := clause.Clause{Name: v.Name()}
+			v.MergeClause(&c)
+			c.Build(stmt)
 		case clause.Expression:
 			v.Build(stmt)
 		case driver.Valuer:

tests/sql_builder_test.go

@@ -445,6 +445,14 @@ func TestToSQL(t *testing.T) {
 	if DB.Statement.DryRun || DB.DryRun {
 		t.Fatal("Failed expect DB.DryRun and DB.Statement.ToSQL to be false")
 	}
+
+	// UpdateColumns
+	sql = DB.ToSQL(func(tx *gorm.DB) *gorm.DB {
+		return tx.Raw("SELECT * FROM users ?", clause.OrderBy{
+			Columns: []clause.OrderByColumn{{Column: clause.Column{Name: "id", Raw: true}, Desc: true}},
+		})
+	})
+	assertEqualSQL(t, `SELECT * FROM users ORDER BY id DESC`, sql)
 }
 
 // assertEqualSQL for assert that the sql is equal, this method will ignore quote, and dialect specials.