POPackage combPack = (POPackage) combinePlan.getRoots().get(0);
POLocalRearrange combRearrange = (POLocalRearrange) combinePlan
.getLeaves().get(0);
setIntermediateOutputKeyValue(combRearrange.getKeyType(), conf, pkgTezOp);
LoRearrangeDiscoverer lrDiscoverer = new LoRearrangeDiscoverer(
combinePlan, pkgTezOp, combPack);
lrDiscoverer.visit();
combinePlan.remove(combPack);
conf.set(TezRuntimeConfiguration.TEZ_RUNTIME_COMBINER_CLASS,
MRCombiner.class.getName());
conf.set(MRJobConfig.COMBINE_CLASS_ATTR,