TOPK.QUERY

Syntax

TOPK.QUERY key item [item ...]

Time complexity: O(k) per queried item, or O(m * k) when querying m items at once

ACL categories: @topk

Checks whether one or more items are currently in the Top-K list stored at key. The key must already exist (created via TOPK.RESERVE); otherwise, an error is returned. Each item is checked via a linear scan of the top-k heap.

Return

Array reply: An array of integers, one per item:

• 1 if the item is in the top-k list.
• 0 if the item is not in the top-k list.

Examples

dragonfly> TOPK.RESERVE topk 2
OK

dragonfly> TOPK.ADD topk foo bar baz
1) (nil)
2) (nil)
3) foo

dragonfly> TOPK.QUERY topk foo bar baz
1) (integer) 0
2) (integer) 1
3) (integer) 1

See also

TOPK.RESERVE | TOPK.ADD | TOPK.COUNT | TOPK.LIST