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[Michal Hruby <michal.hruby@xxxxxxxxxxxxx>]

Disk space usage (with ~60k events):
- original: 77.8MB
- with hashes: 79.7MB

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https://bugs.launchpad.net/bugs/947835

Title:
  FTS doesn't work properly with *Subject groupings

Status in Zeitgeist Framework:
  In Progress

Bug description:
  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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