php - How to group by only by one reference in Doctrine 2 -

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i have 

$qb          = $this->getfindquerybuilder();         $entityalias = $this->getentityalias();      $qb->select([         $entityalias,         'product',         'category',         'categories',         'productcategoriescategory',         'productcategoriesproduct',     ]);      $qb->leftjoin("{$entityalias}.product", 'product');     $qb->leftjoin("{$entityalias}.category", 'category');     $qb->leftjoin("product.categories", 'categories');     $qb->leftjoin("categories.category", 'productcategoriescategory');     $qb->leftjoin("categories.product", 'productcategoriesproduct');

and 

$qb->groupby('product.id');

so when added group expression correctly grouping product.id mistakenly grouping productcategoriesproduct.id, product , productcategoriesproduct same entity... need grouping product.id select productcategoriesproduct inside


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