# kelindar/column

High-performance, columnar, in-memory store with bitmap indexing in Go

Repository: https://github.com/kelindar/column
Canonical: https://ross.abutalabs.com/products/column
Language: Go
License: MIT
License Family: permissive
Topics: db, soa, indexing, bitmap, data-oriented, columnar-storage
Last push: 2025-06-28T09:16:05+00:00

## Health v2 (maintenance only)
Score: 36/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 29, release rhythm 8, longevity 100
- inputs: {"age_days": 1925, "days_push": 431, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1512, forks 68 (observed 2026-08-28T04:04:56.050164+00:00)

## What it is
A Go library providing a high-performance, columnar, in-memory storage engine with bitmap indexing. It supports fast querying, batch updates, SIMD-enabled aggregation and filtering, transactions, and change data streams with zero heap allocations during queries.

## Use cases
- store and query millions of rows in memory in Go
- build fast columnar filtering with bitmap indexes
- run zero-allocation aggregate queries like sum and avg
- stream database commits as a change data feed
- snapshot an in-memory collection to disk
- implement TTL-based row expiration in a Go service

## When to choose
- you need an embedded, in-memory columnar store inside a Go application
- query performance and cache efficiency matter more than persistence features
- you want transactional updates with bitmap-based filtering
- you need change data capture from an in-memory dataset

## When to avoid
- you need durable disk-based storage with full ACID guarantees
- you need SQL, joins, or a client-server database
- your dataset doesn't fit in memory
- you're not working in Go

## Facets
- artifact type: library
- maturity: active
- function: database, search-engine, caching, concurrency
- domain: databases, analytics, performance
- platform: go, windows
- tags: columnar-storage, bitmap-index, in-memory-database, soa, simd, zero-allocation, real-time, linux, macos

## Member repositories
- kelindar/column (main) score 36

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:56.050164+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:32:20.270968+00:00, confidence not recorded.
  - readme: https://github.com/kelindar/column (fetched 2026-08-28T04:04:56.050164+00:00, sha 9c5ac4e5fecf)
- Data as of 2026-08-30T08:39:29.467469+00:00.