rails/arel — pull request #143 by sunaku (2012-09-25 19:21:45+00:00)
Title: [RFC] Arel::SelectManager support for DepthFirst visitor

Hello,

In this commit, I have added a `SelectManager#statement()` method to expose the underlying tree for `DepthFirst` visitor to traverse.

For API consistency, should I do the same for the other `*Manager` classes to add support for traversing them in the `DepthFirst` visitor?

Thanks for your consideration.