vtlim commented on code in PR #12723: URL: https://github.com/apache/druid/pull/12723#discussion_r948532306
########## docs/tutorials/tutorial-sketches-theta.md: ########## @@ -0,0 +1,302 @@ +--- +id: tutorial-sketches-theta +title: Approximations with Theta sketches +sidebar_label: Theta sketches +--- + +A common problem in clickstream analytics is counting unique things, like visitors or sessions. Generally this involves scanning through all detail data, because unique counts **do not add up** as you aggregate the numbers. + +For instance, we might be interested in the number of visitors that watched episodes of a TV show. Let's say we found that at a given day, 1000 unique visitors watched the first episode, and 800 visitors watched the second episode. We may want to explore further trends, for example: +- How many visitors watched _both_ episodes? Review Comment: Added it to line 55 -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
