shengyunyao commented on issue #1947: Add tdigest compression param for pencentile_approx function URL: https://github.com/apache/incubator-doris/issues/1947#issuecomment-540381195 With the different value of compression, we can get results as follows. ``` mysql> select percentile_approx(siteid, 0.8,100) from table1; +-----------------------------------------+ | percentile_approx(`siteid`, 0.8, 100.0) | +-----------------------------------------+ | 67062264.459699914 | +-----------------------------------------+ 1 row in set (5.54 sec) mysql> select percentile_approx(siteid, 0.8,1000) from table1; +------------------------------------------+ | percentile_approx(`siteid`, 0.8, 1000.0) | +------------------------------------------+ | 67026452.899213754 | +------------------------------------------+ 1 row in set (6.71 sec) mysql> select percentile_approx(siteid, 0.8,10000) from table1; +-------------------------------------------+ | percentile_approx(`siteid`, 0.8, 10000.0) | +-------------------------------------------+ | 67022356.721001081 | +-------------------------------------------+ 1 row in set (8.15 sec) mysql> select count(*) from table1; +----------+ | count(*) | +----------+ | 83777768 | +----------+ 1 row in set (2.09 sec) ```
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