text: -- file:opr_sanity.sql ln:1070 expect:true
  SELECT DISTINCT proname, oprname, amopstrategy
  FROM pg_operator AS o, pg_aggregate AS a, pg_proc AS p,
       pg_amop as ao
  WHERE a.aggfnoid = p.oid AND a.aggsortop = o.oid AND
      amopopr = o.oid AND
      amopmethod = (SELECT oid FROM pg_am WHERE amname = 'btree')
  ORDER BY 1, 2
  