epriestley 486f7c1e8e Add aggregated facts to the Facts application ... Summary: Some facts are aggregations of other facts. For example, we may compute how many times each macro is used in each object as a "raw fact": Dnnn uses macro "psyduck" 6 times. But we want to present this data in aggregate form, e.g. "order macros by popularity". We can do this at runtime and it probably won't be too awful a query, but we can also aggregate it cheaply: Macro "psyduck" is used 3920 times across all objects. ...and then do a query like "select macros ordered by usage". "Aggregate" facts support facts like this. The aggregate facts I've implemented are: - Count of all objects. - Count of objects of type X. - Last time facts were updated. These clearly fit the "aggregate" facts template well. I'm not 100% sure macros do. We can use this table to answer a question like "What are the most popular macros, ordered by use?" We can also use it to answer a question like "What are the most popular macros in the last 6 months?", if we build a specific fact for that. But we can't use it to answer a question like "What are the most popular macros between times X and Y?". Maybe that's important; maybe not. This seems like a good fit for at least some types of facts. I'll de-magic the keys a bit in the next diff. Test Plan: Ran the engines and got some aggregated facts about other facts. Reviewers: vrana, btrahan Reviewed By: vrana CC: aran Maniphest Tasks: T1562 Differential Revision: https://secure.phabricator.com/D3089		2012-07-27 13:46:01 -07:00
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PhabricatorFactAggregate.php	Add aggregated facts to the Facts application	2012-07-27 13:46:01 -07:00
PhabricatorFactDAO.php	Add a basic "fact" application	2012-07-27 13:34:21 -07:00
PhabricatorFactRaw.php	Add a basic "fact" application	2012-07-27 13:34:21 -07:00