CF.COUNT

Syntax
CF.COUNT key item
Available in:
Redis Open Source / Bloom 1.0.0
Time complexity:
O(k), where k is the number of sub-filters
ACL categories:
@cuckoo, @read, @slow,

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

key

is key name for a cuckoo filter.

item

is an item to check.

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

Return information

One of the following:

  • 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 the note in CF.DEL.
  • Simple error in these cases: invalid arguments or wrong key type.
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