hyperloglog | HyperLogLog distinct value estimator for Node.js | Time Series Database library

by optimizely JavaScript Version: 0.1.2 License: MIT

X-Ray Key Features Code Snippets(1)Community Discussions(3)Vulnerabilities Install Support

kandi X-RAY | hyperloglog Summary

hyperloglog is a JavaScript library typically used in Database, Time Series Database applications. hyperloglog has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can install using 'npm i hyperloglog' or download it from GitHub, npm.

In order to count items, they must first be hashed. The hash() function provides a suitable hash. Its output is an array of four 32 bit postive integers, which, taken together constitute the complete hash of the input string. Currently the implementation is MurmurHash3-128.

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Quality

Security

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Support

hyperloglog has a low active ecosystem.

It has 79 star(s) with 18 fork(s). There are 154 watchers for this library.

It had no major release in the last 12 months.

There are 1 open issues and 0 have been closed. There are 2 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of hyperloglog is 0.1.2

Quality

hyperloglog has 0 bugs and 0 code smells.

Security

hyperloglog has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

hyperloglog code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

hyperloglog is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

hyperloglog releases are not available. You will need to build from source code and install.

Deployable package is available in npm.

Installation instructions are not available. Examples and code snippets are available.

Top functions reviewed by kandi - BETA

kandi has reviewed hyperloglog and discovered the below as its top functions. This is intended to give you an instant insight into hyperloglog implemented functionality, and help decide if they suit your requirements.

Creates a new Hyperlog object .
Computes the average number of buckets .

Get all kandi verified functions for this library.

hyperloglog Key Features

No Key Features are available at this moment for hyperloglog.

hyperloglog Examples and Code Snippets

Features

maven

Lines of Code : 34

License : No License

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// 1. Create config object
Config config = new Config();
config.useClusterServers()
       // use "rediss://" for SSL connection
      .addNodeAddress("redis://127.0.0.1:7181");

// or read config from file
config = Config.fromYAML(new File("config-f

Community Discussions

Trending Discussions on hyperloglog

How to link the bitcodes of PostgreSQL

Is there a postgres function to mutably update a binary data structure?

Django culmulative sum of HyperLogLog (HLL) Postgres field

QUESTION

How to link the bitcodes of PostgreSQL

Asked 2022-Mar-22 at 08:54

I want to run llvm-slicer (source) for PostgreSQL main executable file (i.e., PG_ROOT/src/backend/postgres) to carry backward slicing on PostgreSQL. llvm-slicer runs on top of bitcode (.bc file). I have compiled PostgreSQL via ./configure CC=clang-6.0 && make CC=clang-6.0, duiring which, the final compile command that link many .o files together is (very long):

...

ANSWER

Answered 2022-Mar-22 at 08:54

Solution: whole-program-llvm.

It provides tools for building whole-program (or whole-library) LLVM bitcode files from an unmodified C or C++ source package. It currently runs on *nix platforms such as Linux, FreeBSD, and Mac OS X.

Source https://stackoverflow.com/questions/71237916

QUESTION

Is there a postgres function to mutably update a binary data structure?

Asked 2021-Feb-09 at 12:34

I have written an AGGREGATE function that approximates a SELECT COUNT(DISTINCT ...) over a UUID column, a kind of poor man's HyperLogLog (and having different perf characteristics).

However, it is very slow because I am using set_bit on a BIT and that has copy-on-write semantics.

So my question is:

is there a way to inplace / mutably update a BIT or bytea?
failing that, are there any binary data structures that allow mutable/in-place set_bit edits?

A constraint is that I can't push C code or extensions to implement this. But I can use extensions that are available in AWS RDS postgres. If it's not faster than HLL then I'll just be using HLL. Note that HLL is optimised for pre-aggregated counts, it isn't terribly fast at doing adhoc count estimates over millions of rows (although still faster than a raw COUNT DISTINCT).

Below is the code for context, probably buggy too:

...

ANSWER

Answered 2021-Feb-09 at 11:58

Yeah, SQL isn't actually that fast for raw computation. I might try a UDF, perhaps pljava or plv8 (JavaScript) which compile just-in-time to native and available on most major hosting providers. Of course for performance, use C (perhaps via LLVM) for maximum performance at maximum pain. Plv8 should take minutes to prototype, just pass an array constructed from array_agg(). Obviously keep the array size to millions of items, or find a way to roll-up your sketches ( bitwuse-AND ?) https://plv8.github.io/#function-calls https://www.postgresqltutorial.com/postgresql-aggregate-functions/postgresql-array_agg-function/

FYI HyperLogLog is available as an open source extension for PostgreSQL from Citus/Microsoft and of course available on Azure. https://www.google.com/search?q=hyperloglog+postgres (You could crib from their coffee and just change the core algorithm, then test side by side). Citus is pretty easy to install, so this isn't a bad option.

Source https://stackoverflow.com/questions/66118133

QUESTION

Django culmulative sum of HyperLogLog (HLL) Postgres field

Asked 2020-May-26 at 07:55

I'm using the HyperLogLog (hll) field to represent unique users, using the Django django-pg-hll package. What I'd like to do is get a cumulative total of unique users over a specific time period, but I'm having trouble doing this.

Given a model like:

...

ANSWER

Answered 2020-May-26 at 07:55

This bug occurs because the django-pg-hll pacakage uses the hll_cardinalityfunction instead of the # operator for window functions. Moving to a raw sql solution fixed the issue.

Source https://stackoverflow.com/questions/61937596

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install hyperloglog

You can install using 'npm i hyperloglog' or download it from GitHub, npm.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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