@Override
  public final void postSetUp() throws Exception {
    Host host = Host.getHost(0);
    server1 = host.getVM(0);
    server2 = host.getVM(1);
    server3 = host.getVM(2);
    client = host.getVM(3);
    createServersWithRegions();
    fillValuesInRegions();
    registerFunctionOnServers();
  }
This tests the querying using a RegionFunctionContext which provides a filter (routing keys) to
run the query on subset of buckets "locally". If query includes buckets
geode-core/src/distributedTest/java/org/apache/geode/cache/query/dunit/QueryUsingFunctionContextDUnitTest.java