entc/gen: minor codegen improvements

examples/fs/ent/file_query.go

@@ -825,9 +825,7 @@ func (fgb *FileGroupBy) sqlQuery() *sql.Selector {
 		for _, f := range fgb.fields {
 			columns = append(columns, selector.C(f))
 		}
-		for _, c := range aggregation {
-			columns = append(columns, c)
-		}
+		columns = append(columns, aggregation...)
 		selector.Select(columns...)
 	}
 	return selector.GroupBy(selector.Columns(fgb.fields...)...)

examples/fs/ent/migrate/migrate.go

@@ -41,8 +41,7 @@ var (
 
 // Schema is the API for creating, migrating and dropping a schema.
 type Schema struct {
-	drv         dialect.Driver
-	universalID bool
+	drv dialect.Driver
 }
 
 // NewSchema creates a new schema client.