tabularize whole file, but each block separately?

[mimooh]

Say my file is

this is a long field, 12345678,3333333333,44444444444
this is also long,134145231451,112412341,3142341341241

short,1,2,3,7,8
short,4,5,6,7,8

I have two blocks here and the second is more tight. The question (or feature request) is can I have each block separately aligned? I mean in one command both blocks.