[tracker] (3 commits) Non-fast-forward update to branch wip/carlosg/zero-or-more-fix

[Carlos Garnacho <carlosg src gnome org>]

The branch 'wip/carlosg/zero-or-more-fix' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  c9d4af0... libtracker-sparql: Fix actual 0-path matches in ? and * pat
  b8ec287... libtracker-data: Hint access cost of "triples" virtual tabl

Commits added to the branch:

  ad0f8ab... libtracker-sparql: Fix actual 0-path matches in ? and * pat
  1004687... tests: Add tests for +/? property path operator finding 0-l
  4a08ea0... libtracker-data: Hint access cost of "triples" virtual tabl