** Branch linked: lp:~thekorn/zeitgeist/faster_origin_queries

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Using the subj_origin column of event_view is slower than it should be
https://bugs.launchpad.net/bugs/673452
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Status in Zeitgeist Framework: New

Bug description:
Let me summarize what we have wrt subj_origin
 1) we have a subj_origin column in the event table, which is an integer 
pointing to an entry in the uri table
 2) we have an index on the subj_origin column of the event table
 3) we have subj_origin in event view, which is not the id, but the resolved 
uri 
 4) we have subj_origin_id in event_view which is in fact the same as 
event.subj_uri, but we get this value by using a sub-query on the uri table.

Points 3) and 4) are the reason why the index on event.subj_origin is never 
used when querying the event_view, example:

DEBUG:zeitgeist.sql:Got query:
QUERY:
SELECT id FROM event_view WHERE subj_origin_id=1 ([])
PLAN:
[0, 0, u'TABLE event']
[0, 0, u'TABLE uri USING PRIMARY KEY']

By simply renaming "event_view.subj_origin" to "event_view.subj_origin_uri" and 
"event_view.subj_origin_id" to "event_view.subj_origin" in combination with 
removing the sub-query we can make queries for the origin id on event_view 
*much* faster.



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