multirow reference in the client

common/proto/tables_data.proto

@@ -271,10 +271,11 @@ message GetTableDataResponse {
   // (NULL becomes ""). The row is returned only if deleted = FALSE.
   map<string, string> data = 1;
 
-  // Configured human-readable value for this row. Empty when that column is
-  // NULL/empty; clients should then visibly fall back to the row id.
-  string row_display_value = 2;
-  string row_display_column = 3;
+  // Configured human-readable values for this row, in display order. A value
+  // is empty when its column is NULL/empty; an empty list means the row is
+  // identified by its id alone.
+  repeated string row_display_values = 2;
+  repeated string row_display_columns = 3;
 }
 
 // Count non-deleted rows.