authors and extra check

The extra check raised in review is added and i've popped my name and email into AUTHOURS

AUTHORS

@@ -81,3 +81,4 @@ Andrew de Andrade <andrew@deandrade.com.br>
 Robert Nix <robert@nicerobot.org>
 Nathan Youngman <git@nathany.com>
 Charles Law <charles.law@gmail.com>; <claw@conduce.com>
+Nathan Davies <nathanjamesdavies@gmail.com>

metadata.go

@@ -119,6 +119,8 @@ func columnKindFromSchema(kind string) (ColumnKind, error) {
 		return ColumnRegular, nil
 	case "compact_value":
 		return ColumnCompact, nil
+	case "static":
+		return ColumnStatic, nil
 	default:
 		return -1, fmt.Errorf("unknown column kind: %q", kind)
 	}