pfmerge #

Merges multiple HyperLogLog data structures into an unique HyperLogLog structure stored at key, approximating the cardinality of the union of the source structures.

[Redis documentation]

pfmerge(key, sources, [options], callback) #

Arguments	Type	Description
`key`	string	Destination key identifier
`sources`	string	List of HyperLogLog source key identifiers
`options`	JSON Object	Optional parameters
`callback`	function	Callback

Options #

Option	Type	Description	Default
`queuable`	boolean	Make this request queuable or not	`true`

Callback Response #

Returns null if successful.

Usage #

// Using callbacks (NodeJS or Web Browser)
kuzzle.memoryStorage.pfmerge('key', ['key1', 'key2', '...'], function (err) {
  // callback called once the action has completed
});
// Using promises (NodeJS only)
kuzzle.memoryStorage.pfmergePromise('key', ['key1', 'key2', '...'])
  .then(() => {
    // resolved once the action has completed
  });

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