I was impressed. Integrating it into my project would require me to spend a bunch more time reviewing it, but it did a better job than I was expecting. The tests it wrote were a particularly useful exploration of the problem space: https://gist.github.com/simonw/f9d0f870e8d1af399a7f366a7f87b...
Ignoring the tests, the first change was adding a single parent id column and the second "more complex" refactoring added few more hash columns to the table (after you've specified that you wanted them, i.e. not an open-ended question)
Its a very impressive model, but I think we have different views on what is complex.
