// Use VertexGroup in Tez
boolean isUnionOpt = conf.getBoolean(PigConfiguration.TEZ_OPT_UNION, true);
if (isUnionOpt) {
UnionOptimizer uo = new UnionOptimizer(tezPlan);
uo.visit();
}
}
public static void processLoadAndParallelism(TezOperPlan tezPlan, PigContext pc) throws VisitorException {