CF.COUNT

CF.COUNT key item

Available in:

Redis Stack / Bloom 1.0.0

Time complexity:

O(k), where k is the number of sub-filters

Returns an estimation of the number of times a given item was added to a cuckoo filter.

If you just want to check that a given item was added to a cuckoo filter, use CF.EXISTS.

Required arguments

Return value

Returns one of these replies:

• Integer reply, where a positive value is an estimation of the number of times item was added to the filter. An overestimation is possible, but not an underestimation. 0 means that key does not exist or that item had not been added to the filter. See note in CF.DEL.
• [] on error (invalid arguments, wrong key type, etc.)

Examples

redis> CF.INSERT cf ITEMS item1 item2 item2
1) (integer) 1
2) (integer) 1
3) (integer) 1
redis> CF.COUNT cf item1
(integer) 1
redis> CF.COUNT cf item2
(integer) 2