правки по ПР

pkg/schema/field/timestamp.go

@@ -51,7 +51,7 @@ func toTimestamp(i interface{}) (interface{}, error) {
 	case uint32:
 		return int64(v), nil
 	default:
-		return 0, fmt.Errorf("unsupported value type: \"%T\"", i)
+		return nil, fmt.Errorf("unsupported value type: \"%T\"", i)
 	}
 }