Magento 2: join custom table with product collection while sql query is running fine

I finallly found solution. Actually collection making alias for join table. You don't have to set alias

$joinConditions = 'e.entity_id = store_price.product_id';
$collection->addAttributeToSelect('*');
$collection->getSelect()->join(
             ['store_price'],
             $joinConditions,
             []
            )->columns("store_price.product_price")
              ->where("store_price.store_id=1");