public SecondaryKeyOptimizer visitSecondaryKeyOptimizer(String query)
throws Exception, VisitorException {
PhysicalPlan pp = Util.buildPp(pigServer, query);
MROperPlan mrPlan = Util.buildMRPlan(pp, pc);
SecondaryKeyOptimizerMR so = new SecondaryKeyOptimizerMR(mrPlan);
so.visit();
return so;
}