Execution example::

  > select --table Site --filter "1" --scorer "_score = rand()" --output_columns _id,_key,_score --sortby _score
  [[0,1317212734.38283,0.000354558],[[[9],[["_id","UInt32"],["_key","ShortText"],["_score","Int32"]],[6,"http://example.com/rab",424238335],[9,"http://example.com/vdw",596516649],[7,"http://example.net/atv",719885386],[2,"http://example.net/",846930886],[8,"http://example.org/gat",1649760492],[3,"http://example.com/",1681692777],[4,"http://example.net/afr",1714636915],[1,"http://example.org/",1804289383],[5,"http://example.org/aba",1957747793]]]]
  > select --table Site --filter "1" --scorer "_score = rand()" --output_columns _id,_key,_score --sortby _score
  [[0,1317212734.58497,0.000350529],[[[9],[["_id","UInt32"],["_key","ShortText"],["_score","Int32"]],[4,"http://example.net/afr",783368690],[2,"http://example.net/",1025202362],[5,"http://example.org/aba",1102520059],[1,"http://example.org/",1189641421],[3,"http://example.com/",1350490027],[8,"http://example.org/gat",1365180540],[9,"http://example.com/vdw",1540383426],[7,"http://example.net/atv",1967513926],[6,"http://example.com/rab",2044897763]]]]