pk1,pk2,content,sortable,sortable_with_nulls,sortable_with_nulls_2,text
f,z,f-z,10,0.4515549159652815,0.3987301842569533,$null
e,z,e-z,16,0.8453039251425987,0.8533354586601858,$blah
d,z,d-z,-31,,0.8894228892924536,$blah