@Override
  public void setInitialized() {
    cqResultKeysInitialized = true;
  }
This holds the keys that are part of the CQ query results. Using this CQ engine can determine
whether to execute query on old value from EntryEvent, which is an expensive operation.

NOTE: In case of RR this map is populated and used as intended. In case of PR this map will not
be populated. If executeCQ happens after update operations this map will remain empty.
geode-cq/src/main/java/org/apache/geode/cache/query/cq/internal/ServerCQResultsCachePartitionRegionImpl.java