Execution example::

  > load --table event_query --each 'suggest_preparer(_id, type, item, sequence, time, pair_query)'
  > [
  > {"sequence": "3", "time": 1312950803.86057, "item": "search engine", "type": "submit"},
  > {"sequence": "3", "time": 1312950808.86057, "item": "web search realtime", "type": "submit"}
  > ]
  [[0,1317212847.69365,0.801326259],2]