Valkey Roaring

Appearance

R.BITCOUNT / R64.BITCOUNT ​

Returns the cardinality (number of set bits).

SyntaxR.BITCOUNT key
64-bitR64.BITCOUNT key
Time complexityO(1)

Arguments ​

  • key — the bitmap key

Reply ​

Integer; 0 for a missing key.

Notes ​

  • Roaring caches per-container cardinalities, so this is a lookup, not a scan.

Example ​

bash
127.0.0.1:6379> R.BITCOUNT k
(integer) 3