pfmerge

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

[Redis documentation]

Arguments

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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

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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);
}