Support use clause.Expression as argument

clause/select_test.go

@@ -43,6 +43,23 @@ func TestSelect(t *testing.T) {
 			}, clause.From{}},
 			"SELECT `id`, `name`, LENGTH(`mobile`) FROM `users`", nil,
 		},
+		{
+			[]clause.Interface{clause.Select{
+				Expression: clause.CommaExpression{
+					Exprs: []clause.Expression{
+						clause.Expr{
+							SQL: "? as name",
+							Vars: []interface{}{clause.Eq{
+								Column: clause.Column{Name: "age"},
+								Value:  18,
+							},
+							},
+						},
+					},
+				},
+			}, clause.From{}},
+			"SELECT `age` = ? as name FROM `users`", []interface{}{18},
+		},
 	}
 
 	for idx, result := range results {

statement.go

@@ -183,6 +183,8 @@ func (stmt *Statement) AddVar(writer clause.Writer, vars ...interface{}) {
 			v.Build(stmt)
 		case *clause.Expr:
 			v.Build(stmt)
+		case clause.Expression:
+			v.Build(stmt)
 		case driver.Valuer:
 			stmt.Vars = append(stmt.Vars, v)
 			stmt.DB.Dialector.BindVarTo(writer, stmt, v)

tests/go.mod

@@ -3,11 +3,13 @@ module gorm.io/gorm/tests
 go 1.14
 
 require (
+	github.com/denisenkom/go-mssqldb v0.12.0 // indirect
 	github.com/google/uuid v1.3.0
 	github.com/jackc/pgx/v4 v4.14.1 // indirect
 	github.com/jinzhu/now v1.1.4
 	github.com/lib/pq v1.10.4
-	golang.org/x/crypto v0.0.0-20211209193657-4570a0811e8b // indirect
+	github.com/mattn/go-sqlite3 v1.14.10 // indirect
+	golang.org/x/crypto v0.0.0-20220126234351-aa10faf2a1f8 // indirect
 	gorm.io/driver/mysql v1.2.3
 	gorm.io/driver/postgres v1.2.3
 	gorm.io/driver/sqlite v1.2.6