CF.EXISTS
Syntax
CF.EXISTS key item
Time complexity: O(k), where k is the number of sub-filters
ACL categories: @cuckoo
Checks whether item exists in the Cuckoo filter at key.
Cuckoo filters may return false positives — an item that was never inserted may
still be reported as present due to a fingerprint collision. False negatives are
not possible: if an item was inserted and never deleted, CF.EXISTS will always
return 1.
If key does not exist, 0 is returned.
Return
1if the item exists (or is a false positive match).0if the item does not exist.
Examples
dragonfly> CF.ADD cf Hello
(integer) 1
dragonfly> CF.EXISTS cf Hello
(integer) 1
dragonfly> CF.EXISTS cf World
(integer) 0
dragonfly> CF.EXISTS no_such_key item
(integer) 0