union in get_initial_queryset in datatable

list=Model1.objects.filter(               reservation__in=Model.objects.filter(resource__in=resources).union(              Model2.objects.filter(       reservation__in=Model.object.filter(resource__in=resources).defer('col4','col5','col6'),                Model3.objects.filter(                   reservation__in=Model.objects.filter(resource__in=resources),\              Model4.objects.filter(                   reservation__in=Model.objects.filter(resource__in=resources).defer('col4')

I am trying to resturn this queryset in get_initial_queryset in datatable.But getting an error 

raise DatabaseError('ORDER BY term does not match any column in the result set.')

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