[JAVA-3862] Exact count distinct stage and 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-3223 Exact count distinct stage and accumu... Blocked
Depends
Issue split
split from DRIVERS-1613 Support exact count distinct stage an... Closed

 Description   

Summary

Add a concise way to compute the number of distinct values.

Motivation

Count distinct is one of the most common statistics used in analytics. While it is possible to express it in MQL, it is much less concise than in SQL, especially when multiple count distinct values need to be computed over the same input. Moreover, users are confused about what algorithm is recommended.


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