what is values_list in django orm
Test.objects.all() time: 0.010061947107315063
Test.objects.all().values('first') time: 0.00578328013420105
Test.objects.all().values_list('first') time: 0.005257354974746704
Test.objects.all().values_list('first', flat=True) time: 0.0052023959159851075
Test.objects.all().only('first') time: 0.011166254281997681