public boolean tableExists(String dbName, String tableName) {
        return metastore.tableExists(dbName, tableName);
    }
@Test
    public void testTableExists() {
        CachingHiveMetastore cachingHiveMetastore = new CachingHiveMetastore(
                metastore, executor, expireAfterWriteSec, refreshAfterWriteSec, 1000, false);
        Assert.assertTrue(cachingHiveMetastore.tableExists("db1", "tbl1"));
    }