@Override
  // TODO: implement using SharedCache
  public List<Partition> getPartitionsByFilter(String catName, String dbName, String tblName, GetPartitionsArgs args)
      throws MetaException, NoSuchObjectException {
    return rawStore.getPartitionsByFilter(catName, dbName, tblName, args);
  }
This starts a background thread, which initially populates the SharedCache and later
periodically gets updates from the metastore db

@param conf
@param runOnlyOnce
@param shouldRunPrewarm
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/cache/CachedStore.java