function support in v1.2.2

```
I'm creating a select statement with function eg. select max(column) from table.

I din't found any method to create the statement with the function. Please help.

What version of the product are you using? On what operating system?
I'm using version 1.2.2

```

Original issue reported on code.google.com by `mywords....@gmail.com` on 19 Jul 2013 at 6:38

No source files, tests, or entry points are named. Start by locating the select-statement API and its existing query-building tests, then determine how function expressions such as max(column) should be represented; done means a select statement can express the reported example and the behavior is covered by tests.

Written by the indexing model from the issue text.