📄️ BITMAP
BITMAP 类型用于加速 count distinct 去重计数，相比 HLL 更精确但消耗更多资源。
📄️ HLL (HyperLogLog)
HLL (HyperLogLog) 类型用于近似去重，基于 HyperLogLog 算法实现，误差约为 1%。
版本：Latest-4.1
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