[JAVA-3864] Approximate count distinct accumulator Created: 06/Aug/20  Updated: 22/Jun/22

Status: Blocked
Project: Java Driver
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Improvement Priority: Major - P3
Reporter: Backlog - Core Eng Program Management Team Assignee: Unassigned
Resolution: Unresolved Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Cloners
is cloned by CSHARP-3224 Approximate count distinct accumulator Blocked
Depends
Issue split
split from DRIVERS-1612 Investigate changes in PM-1938: Appro... Closed

 Description   

Summary

Add an approximate count distinct accumulator.

Motivation

Exact count distinct (PM-1936) is an important analytical tool but it is computationally expensive (see Appendix in here). Therefore, users often prefer to use an approximate statistic that can be applied to large volumes of data. This effort will also pave the way to support approximate count distinct in on-demand materialized views, as the exact count distinct accumulator cannot easily be incremented.


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