jnturton commented on pull request #2432:
URL: https://github.com/apache/drill/pull/2432#issuecomment-1023204744


   @tdunning when you say "median accuracy" there, do you mean median estimate 
error across the entire distribution, or do you mean estimate error 
specifically near the distribution's median?  Do you think that in the case of 
Drill we'd make no assumptions about user data distributions, and opt for a 
t-digest scale factor that optimises an _overall_ accuracy statistic rather 
than one that targets any specific area (e.g. tails, median).  PS I'm waving my 
hands a bit here, I don't know if what I've said is well defined...


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