public TableWrapper addTableToCache(String catName, String dbName, String tblName, Table tbl) {
    try {
      cacheLock.writeLock().lock();
      TableWrapper wrapper = createTableWrapper(catName, dbName, tblName, tbl);
      tableCache.put(CacheUtils.buildTableKey(catName, dbName, tblName), wrapper);
      isTableCacheDirty.set(true);
      return wrapper;
    } finally {
      cacheLock.writeLock().unlock();
    }
  }
Replaces the old db object with the new one. This will add the new database to cache if it does
not exist.
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/cache/SharedCache.java