superdiaodiao commented on issue #31320:
URL: https://github.com/apache/doris/issues/31320#issuecomment-2066379568

   > > Could you give us more info? Like, how this function behaves in another 
OLAP engine or mysql or others.
   > 
   > 我们现在的场景是: 在导入doris之前,为了减少数据量,我们使用spark或者flink按照不同维度进行了聚合, 
而我们的指标又需要用到近似计算去计算uv值, 目前这个场景我们只能直接将明细数据导入doris, 这个对 doris的压力就非常大。 
因此我们希望Doris能支持这个函数, 有了这个函数, 我们就可以在spark或者flink编写udaf hll_to_base64, 
在聚合的时候计算出base64值, 然后在导入Doris的时候使用 hll_from_base64完成导入。 非常感谢关注这个问题。
   
   Moreover, you can use our hll UDFs including to_hll in hive/spark to load 
data into doris after this PR: https://github.com/apache/doris/pull/33896


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