v.18.16New Feature
New Parameter for Configuring Precision in uniqCombined Function
Now you can use a parameter to configure the precision of the uniqCombined aggregate function (select the number of HyperLogLog cells). #3406Why it matters
This feature enables users to control the trade-off between accuracy and memory usage when using theuniqCombined function, allowing for more precise or lightweight distinct count estimations depending on their needs.How to use it
When calling theuniqCombined aggregate function, provide an additional parameter specifying the desired number of HyperLogLog cells to set the precision. For example: uniqCombined(1024)(column).