[GitHub] [incubator-doris] shengyunyao opened a new issue #1947: Add tdigest compression param for pencentile_approx function

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shengyunyao opened a new issue #1947: Add tdigest compression param for pencentile_approx function
URL: https://github.com/apache/incubator-doris/issues/1947
 
 
   Someone use doris and test the pencentile_approx function. He found that this function in doris is much slower than that in clickhouse.
   
   The algorithms of pencentile_approx function in doris and clickhouse are the same. One of the reasons is that digest compresion in clickhouse is 2048, but it is 10000 in doris. That means we can get a more precise result in doris with the cost of much time.
   
   So, we enable uses to set the compression param to trade off the precision and time cost by themselves.
   
   

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