TOPK.COUNT
Syntax
TOPK.COUNT key item [item ...]
Time complexity: O(n) where n is the number of items
ACL categories: @topk
Returns the estimated count of one or more items in the Top-K data structure stored at key.
The key must already exist (created via TOPK.RESERVE); otherwise, an error is returned.
The returned counts are estimates and may differ from the true counts due to the probabilistic nature of the underlying Count-Min Sketch.
An item can have a non-zero estimated count even if it is not currently in the top-k list (as reported by TOPK.QUERY).
Return
Array reply: An array of integers, one per item, representing the estimated count of each queried item.
Examples
dragonfly> TOPK.RESERVE topk 3
OK
dragonfly> TOPK.ADD topk foo foo foo bar bar baz
1) (nil)
2) (nil)
3) (nil)
4) (nil)
5) (nil)
6) (nil)
dragonfly> TOPK.COUNT topk foo bar baz
1) (integer) 3
2) (integer) 2
3) (integer) 1