mysql - Why is left joining in my query so much slower than lazy loading? -


i using doctrine2 symfony2. have query in userrepository looks this:

$qb = $this->createquerybuilder('u')         ->addselect('s', 'p', 'a', 'fp', 'ea', 'c')         ->leftjoin('u.subscription', 's')         ->leftjoin('s.plan', 'p')         ->leftjoin('u.applications', 'a')         ->leftjoin('u.facebook_pages', 'fp')         ->leftjoin('u.editable_apps', 'ea')         ->leftjoin('u.coupons_redeemed', 'c')         ->where('u = :user')         ->setparameter('user', $user)         ;  return $qb->getquery()->getsingleresult();

according symfony profiler, 1 query takes around 63 ms. when comment out a , fp left joins , instead user object , $user->getfacebookpages() , $user->getapplications(), have 3 queries take around 3.50 ms.

how can make query left joins fast lazy loading related entities?


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