twitter/querulous — pull request #44 by rvpgithub (2012-03-21 16:23:45+00:00)
Title: Fix a call by name that causes tons of QueryFactory objects to be created

Seems like this was done as part of adding support for tracing, basically to provide a way to add "shutdown" functionality to QueryFactory. This doesn't seem like a good approach though, and I have added a TODO to revisit that (tracing is not currently in use).