docs: protected final void cacheClear() {
  
          int i = sysTables.length;
  
          while (i-- > 0) {
              Table t = sysTables[i];
  
              if (t != null) {
                  t.clearAllData(session);
              }
  
              sysTableSessions[i] = null;
          }
  
          isDirty = false;
      }