Added tests for SQL functions
Added tests for SQL functions

Ignore-this: 850af61d9a83b947c17f2e2a3ac048e2

Some tests covering how SQL functions are generated in queries
were added.

darcs-hash:20090409222539-447ee-619ab1b9169cc735ea66fb30fd025b41a0a9a146.gz

m4dc4p/haskelldb