D11827: Do not retrieve mtime from database repeatedly when sorting

[Stefan Brüns]

bruns created this revision.
Restricted Application added projects: Frameworks, Baloo.
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REVISION SUMMARY
  For larger result sets, querying the mtime (once for lhs and rhs each)
  on each sorting step contributes significantly to the execution time.
  Retrieve the mtime once for each document and use it for searching.
  
  Test results:
  $> build/bin/baloosearch -l 1 type=image
  /home/stefan/DE15_Connector_Pinout.svg
  Elapsed: 0.432438 msecs
  
  $> baloosearch -l 1 type=image
  /home/stefan/DE15_Connector_Pinout.svg
  Elapsed: 3.66243 msecs
  
  $> build/bin/baloosearch  type=image | wc -l
  Elapsed: 3.19816 msecs
  1017
  
  $> baloosearch  type=image | wc -l
  Elapsed: 7.45712 msecs
  1017
  
  Signed-off-by: Stefan Brüns <stefan.bruens at rwth-aachen.de>

REPOSITORY
  R293 Baloo

BRANCH
  searchstore_speedup_1

REVISION DETAIL
  https://phabricator.kde.org/D11827

AFFECTED FILES
  src/lib/searchstore.cpp

To: bruns
Cc: #frameworks, ashaposhnikov, michaelh, astippich, spoorun, ngraham, alexeymin
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