Too many fields yields error

Hello,

I am trying to create a view with the views bonus export module, to export data to a CSV file that I have stored in a database with many CCK fields. I add all of the fields I need to export, but when I get past a certain number of fields I receive the following error:

user warning: Too many tables; MySQL can only use 61 tables in a join query:

and exporting doesn't work correctly. I've reduced the number of fields and it works fine but once I hit a magical number of fields it starts throwing up the error again. Any suggestions?