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{
"PFCOUNT": {
"summary": "Returns the approximated cardinality of the set(s) observed by the HyperLogLog key(s).",
"complexity": "O(1) with a very small average constant time when called with a single key. O(N) with N being the number of keys, and much bigger constant times, when called with multiple keys.",
"group": "hyperloglog",
"since": "2.8.9",
"arity": -2,
"function": "pfcountCommand",
"command_flags": [
"READONLY",
"MAY_REPLICATE"
],
"acl_categories": [
"HYPERLOGLOG"
],
"key_specs": [
{
"notes": "RW because it may change the internal representation of the key, and propagate to replicas",
"flags": [
"RW",
"ACCESS"
],
"begin_search": {
"index": {
"pos": 1
}
},
"find_keys": {
"range": {
"lastkey": -1,
"step": 1,
"limit": 0
}
}
}
],
"arguments": [
{
"name": "key",
"type": "key",
"key_spec_index": 0,
"multiple": true
}
],
"reply_schema": {
"description": "The approximated number of unique elements observed via PFADD",
"type": "integer"
}
}
}
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