Dede自定义搜索结果页显示自定义字段

$query = "select arctype.* FROM $addontable addon
  left join dede2_arctype arctype on arctype.id=addon.typeid
  $where $orderby";
 } else {
  $query = "select main.id as aid,main.*,main.description as description1, type.*
 from $maintable main
 left join dede2_arctype type on type.id=main.typeid
 left join $addontable addon on addon.aid=main.id
 $where  $orderby";

$query = "select addon.*, arctype.* from $addontable addon
  left join dede2_arctype arctype on arctype.id=addon.typeid
  $where $orderby";
 } else {
  $query = "select addon.*,main.id as aid,main.*,main.description as description1, type.*
 from $maintable main
 left join dede2_arctype type on type.id=main.typeid
 left join $addontable addon on addon.aid=main.id
 $where  $orderby";