docs: Table findUserTableForIndex(Session session, String name,
                                  String schemaName) {
  
          Schema   schema    = (Schema) schemaMap.get(schemaName);
          HsqlName indexName = schema.indexLookup.getName(name);
  
          if (indexName == null) {
              return null;
          }
  
          return findUserTable(session, indexName.parent.name, schemaName);
      }