pk1,pk2,content,sortable,sortable_with_nulls,sortable_with_nulls_2,text
b,q,b-q,29,,0.09229846771273342,$null
c,d,c-d,29,0.30928466220865325,,$blah
f,y,f-y,29,0.09917846167904198,0.6547129575231422,$null