Home / ducklake
duckdb/ducklake
DuckLake is an integrated data lake and catalog format
C++
Our summary
DuckLake is an open lakehouse format built on SQL and Parquet that integrates with DuckDB. It stores metadata in a catalog database and data in Parquet files, allowing direct reading and writing through DuckDB.
Who it is for: DuckDB users building data lakes and lakehouses
What the README claims
- Supports time travel to query previous versions of tables
FROM my_ducklake.my_table AT (VERSION => 2);
Not checked - Supports schema evolution by adding columns to existing tables
ALTER TABLE my_ducklake.my_table ADD COLUMN new_column VARCHAR;
Not checked - Provides change data feed to track inserts, updates and deletes
FROM my_ducklake.table_changes('my_table', 2, 2);
Not checked
Written by AI from the project's README on 2026-10-08. It does not affect the verdict.
Watching: no other rule matched yet.
3,055 stars on GitHub. Last push 1 day ago.
Verdict
REAL scored 1h ago
- Hype
- 95
- Reality
- 86
- Hype Gap
- +9
- Momentum
- -
- Confidence
- 70%
- Responsive moves Reality +15 points.
- Maintained moves Reality +10 points.
Rule verdict-1.0, scoring score-1.0. How we score. Backtest.
Repository on GitHub Project homepage
Maintained by
Maintained by 1 primary developer, 2 external contributors in the last 90 days.
- duckdb is a GitHub organization.
- GitHub account created April 2021.
- Top contributors by commits: pdet 53%, Mytherin 19%, dentiny 5%.
Why now 34 Hacker News points in the last 7 days.
- Stars StarsThe number of GitHub stars on the repository at our latest reading.
- 3,055
- Gain 7d Gain 7dStars gained since our latest reading from at least 7 days ago.
- n/a
- Pace Velocity (Nx usual pace)This week's star gain divided by the project's usual weekly gain. The usual gain is the average weekly gain over the 4 weeks before (days 8 to 35 ago), counted as at least 10 stars. 2.0x means twice the usual pace. Without a reading from 35 days ago, the ranking assumes 2% of the stars the project had 7 days ago as its usual weekly gain. More on the methodology page
- n/a
- HN points HN pointsHacker News points added up across posts that mention the project, published in the last 7 days.
- 34 7 days
- Downloads DownloadsDownloads per day of the project's package, as the registry (npm or PyPI) reports them.
- n/a
- Contributors Contributors, all timePeople and anonymous contributors who have ever committed to the repository, as GitHub counts them. A small number is context, not a flaw: many solid projects are kept by one or two people.
- 88
- Last release Latest releaseDays since the latest GitHub release was published.
- n/a
Gain 24h Gain 24hStars gained since our latest reading from at least 24 hours ago. n/a. Forks ForksThe number of GitHub forks of the repository at our latest reading. 271. Open issues Open issuesThe number of open issues on the repository at our latest reading, as GitHub counts them. 123. Days since push Days since pushDays since the last push to the repository. 1 day. Archived ArchivedWhether the owner has archived the repository on GitHub. An archived repository is read-only. no. Hacker News posts in 7 days Hacker News postsThe number of Hacker News posts that mention the project, published in the last 7 days.: 1. Watchers WatchersThe number of GitHub users watching the repository for notifications, at our latest reading. 27.
Facts
Nerd stuff
- Docs
- docs/ folder (detected), examples/ folder (detected)
- License
- MIT (detected)
The Receipts
| Source | Evidence | Date |
|---|---|---|
| Hacker News | Thread, 34 points, 2 comments | 7 Oct 2026 |
What changed recently
GitHub release dates we stored. We do not track license changes yet.
Cite this
ducklake is a GitHub project at https://github.com/duckdb/ducklake written mainly in C++, described there as "DuckLake is an integrated data lake and catalog format".
Source: https://midorreal.com/project/duckdb-ducklake, checked 8 October 2026. The same facts as JSON: /project/duckdb-ducklake.json.
Rank history
Hot on Hacker News: #32 today.
New to our radar: #6 today.
Stars
Events in this window
Dated items we stored, last 30 days. They sit near the chart, they do not explain it.
Packages
? We have not checked the package registries for this project yet.
Signals
| Source | What we measured | Checked |
|---|---|---|
| GitHub | 3,055 stars | 8 Oct 2026 |
| Hacker News | 1 post stored, 34 points in the last 7 days | 8 Oct 2026 |
| Feed mentions | Not tracked yet | - |
| npm | Not tracked yet | - |
| PyPI | Not tracked yet | - |
| Docker Hub | Not tracked yet | - |
| crates.io | Not tracked yet | - |
| Homebrew | Not tracked yet | - |
| deps.dev | Not tracked yet | - |
| Hugging Face | Not tracked yet | - |
| Bluesky | Not tracked yet | - |
| Stack Exchange | Not tracked yet | - |
| YouTube | Not tracked yet | - |
Attention vs adoption
Attention: not enough data to rank
Star velocity against all tracked projects
Adoption: not enough data to rank
Downloads, dependents and pulls
Not enough comparable data yet to set attention against adoption. This describes the numbers; it is not a verdict.
Hacker News
| Post | Points PointsThe points the post has on Hacker News. | Comments CommentsThe number of comments on the post on Hacker News. | Date |
|---|---|---|---|
| Hacker News post | 34 | 2 | 7 Oct 2026 |
Caveats
Repo health
- Languages LanguagesShare of the repository's code by bytes, as GitHub's language detection reports it. The five biggest languages are named and the rest are grouped as Other.C++ 98%, Python 2%
- License LicenseThe SPDX license id GitHub detects, and a class: Open source (OSI) if the license is on the Open Source Initiative approved list, Source-available if the code is readable but the license limits use, Unclear if GitHub cannot match a known license, No license detected if it finds none. A public repository without a license is not open source.MIT, Open source (OSI)
- Repository age Repository ageTime since the repository was created on GitHub. This is the repository, not necessarily the project, which may have existed elsewhere before.19 months, created 3 Mar 2025
Development
- Commits in the last 7 days Commits in the last 7 daysCommits to the repository in the last 7 days, as GitHub counts them.202
- Commits in the last 30 days Commits in the last 30 daysCommits to the repository in the last 30 days, as GitHub counts them.417
- Commits in the last 90 days Commits in the last 90 daysCommits to the repository in the last 90 days, as GitHub counts them.705
- Contributors, all time Contributors, all timePeople and anonymous contributors who have ever committed to the repository, as GitHub counts them. A small number is context, not a flaw: many solid projects are kept by one or two people.88
- Releases ReleasesThe number of GitHub releases, and how many days ago the latest one was published.0
- Issues in the last 30 days Issues in the last 30 daysIssues opened and issues closed in the last 30 days, as GitHub search counts them.30 opened, 107 closed
- Pull requests merged in the last 30 days Pull requests merged in the last 30 daysPull requests merged in the last 30 days, as GitHub search counts them.81
Maintenance
- Median time to first reply on issues Median time to first reply on issuesMedian time between an issue being opened and the first comment from someone other than its author, over a sample of the last 30 closed issues. Issues with no reply are left out of the median and counted separately.4 days
- Median time to close issues Median time to close issuesMedian time from opening to closing, over a sample of the last 30 closed issues.5 days
- Sampled issues with no reply Sampled issues with no replyHow many of the sampled closed issues never got a comment from someone other than their author.5 of 7
- Stale open issues Stale open issuesOpen issues with no update in the last 90 days, as GitHub search counts them.34
- Open pull requests Open pull requestsPull requests open now, as GitHub search counts them.53
Hygiene
- Automated tests or builds (CI) Automated tests or builds (CI)Whether the repository has at least one GitHub Actions workflow file in .github/workflows.Yes
- A tests folder A tests folderWhether the repository has a top-level folder named tests, test, __tests__ or spec.Yes
- A license A licenseWhether GitHub detects a license file in the repository.Yes
- Contributing guide Contributing guideWhether the repository has a contributing guide.No
- Code of conduct Code of conductWhether GitHub finds a code of conduct in the repository.No
- CODEOWNERS file CODEOWNERS fileWhether the repository has a CODEOWNERS file, which names who reviews changes to which files.No
- A Dockerfile A DockerfileWhether the repository has a Dockerfile at its top level.No
Security
- Security policy Security policyWhether the repository has a SECURITY.md or SECURITY.rst file.No
- Unpatched high or critical advisories Unpatched high or critical advisoriesPublished GitHub security advisories rated high or critical on this repository that list a vulnerable version with no patched version.0
Badge
For maintainers: one measured fact, no verdict. 
Markdown
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It shows the verdict as this page shows it today.
Markdown
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Key facts as Markdown
# ducklake
- Repository: https://github.com/duckdb/ducklake
- Page: https://midorreal.com/project/duckdb-ducklake
- Verdict: REAL (measured), scored 2026-10-08
- Scores: Hype 95, Reality 86, Hype Gap +9
- Stars: 3,055
- Methodology: https://midorreal.com/methodology#verdicts
- JSON: https://midorreal.com/project/duckdb-ducklake.jsonAlso as JSON.
First tracked 8 Oct 2026 at 3,045 stars.
- GitHub data 42 min old
- Hacker News data 12 min old
Projects talked about on Hacker News
Figures by method 1.0