如何计算Cassandra表格中的大概键数？

我已经看到了对‘Number of key(estimate)来自运行的引用nodetool cfstats，但至少在我的系统中（Cassandra版本3.11.3），我没有看到它：

       Table: XXXXXX
        SSTable count: 4
        Space used (live): 2393755943
        Space used (total): 2393755943
        Space used by snapshots (total): 0
        Off heap memory used (total): 2529880
        SSTable Compression Ratio: 0.11501749368144083
        Number of partitions (estimate): 1146
        Memtable cell count: 296777
        Memtable data size: 147223380
        Memtable off heap memory used: 0
        Memtable switch count: 127
        Local read count: 9
        Local read latency: NaN ms
        Local write count: 44951572
        Local write latency: 0.043 ms
        Pending flushes: 0
        Percent repaired: 0.0
        Bloom filter false positives: 0
        Bloom filter false ratio: 0.00000
        Bloom filter space used: 2144
        Bloom filter off heap memory used: 2112
        Index summary off heap memory used: 240
        Compression metadata off heap memory used: 2527528
        Compacted partition minimum bytes: 447
        Compacted partition maximum bytes: 43388628
        Compacted partition mean bytes: 13547448
        Average live cells per slice (last five minutes): NaN
        Maximum live cells per slice (last five minutes): 0
        Average tombstones per slice (last five minutes): NaN
        Maximum tombstones per slice (last five minutes): 0
        Dropped Mutations: 0

有没有办法select count(*) from XXXXXX用这个版本的Cassandra 来近似？