pfmerge #

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

[Redis documentation]

Arguments #

pfmerge(dest, sources, [options]);

Arguments	Type	Description
`dest`	string	Destination key
`sources`	string[]	List of HyperLogLog keys to merge
`options`	object	Optional query arguments

options #

The options arguments can contain the following option properties:

Property	Type (default)	Description
`queuable`	boolean (true)	If true, queues the request during downtime, until connected to Kuzzle again

Resolve #

Resolves once the operation succeeds.

Usage #

try {
  await kuzzle.ms.pfadd('hllfoo', ['foo', 'bar', 'baz']);
  await kuzzle.ms.pfadd('hllfoo2', ['hello', 'world', 'foo']);
  await kuzzle.ms.pfmerge('hllmerged', ['hllfoo', 'hllfoo2']);
  // Prints: 5
  console.log(await kuzzle.ms.pfcount(['hllmerged']));
} catch (error) {
  console.error(error.message);
}

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