Cannot run demo about nquery HOT 1 OPEN

    function doSelectFilter(dc, ar) {

  var ast = ar.getAst();
  var DB = ar.getDB();   
  var type = ar.getType();



  var tbName  = ar.getTableOrig();
  var tbAlias = ar.getTableAlias();
  var tbl = new Table(dc[DB][tbName]);
  tbl = tbl.get(tbName, tbAlias);   
  if(1<ast.from.length){
      frdl.each(ast.from, function(i, t){
              if(t.join){
                   var db2 = t.db;
                   var tbName2  = t.table;
                   var tbAlias2 = t.as;
                   var tbl2 = new Table(dc[db2][tbName2]);
                   tbl2 = tbl2.get(tbName2, tbAlias2); 
                   tbl = doJoin(tbl, tbl2, t.join, t.on );
              }
      });       
  }   

  return select(tbl, ar);
}