rails/rails — pull request #9919 by kennyj (2013-03-25 16:06:34+00:00)
Title: Add support nested query parameter in DATABASE_URL. Fix #9896.

Please see #9896.

We often need to pass driver specific properties to JDBC adapter.

```ruby
development:
adapter: postgresql
...
properties:
name: value
```

But ENV["DATABASE_URL"] can't pass such properties for same purpose.
BTW, my first commit for this problem was 0ec6bc58d3d2149ac296496a04d7ceafe23f6067. But I thought AR shouldn't depend on `rack`