Adding massif profiles where one is current FTS and the other does the
collapsing (using md5-hashes the uris, see RainCT's branch)
** Attachment added: "massif.out.without_hashes"
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FTS doesn't work properly with *Subject groupings
Status in Zeitgeist Framework:
Currently FTS is only approximating results when any of the *Subject
groupings are used. This means that asking FTS for 20 most recent
subjects containing "a" can right now return anything between 1 and 60
different subjects all depending on the order of recent events.
The idea here is to use xapian's collapse key functionality to be able
to get rid of this approximation while doing performance and memory
requirement measurements of its impact.
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