1
A Jev that can ask Opus for help gives Opus accuracy at 4x lower cost
We tested Jev and GPT-6 Luna as judges for identity resolution. A hybrid of Jev and Claude Opus matched frontier accuracy at over 4x lower cost.
New
The latest blog posts to take off on Hacker News. 241 posts.
2
Can GROUP BY still be optimized after all these years?
An optimization that made Pivot significantly faster on GROUP BY queries with a Top-K operator above them, and a walkthrough of how analytical databases run GROUP BY in the first place.
3
There is no posttraining data commons
The LLM revolution ran on a pretraining commons that humanity built for other reasons. Posttraining consumes tasks, not documents, and no such commons exists. If the open models community wants...
4
Moving our warehouse off DuckDB
We moved our warehouse product off DuckDB and DuckLake onto our own flavor of Trino and a new open table format, HogLake. Here's what broke at scale and why.
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Jepsen: ParticleDB 1.1.4
Modern applications often spread state across a variety of systems: databases, caches, queues, data warehouses, search indices, and so on. Coordinating these systems is challenging: caches are often stale, the analytics platform might lag days behind the primary database, the search index might lose data, and…
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Postgres 19 is late because so many more bugs are being found now
Over the past decade, the timing of PostgreSQL major releases has become very predictable: no earlier than the middle of September, and no l...
7
Zombie stats: Where the numbers AI quotes come from
We asked five AI assistants 200 questions that call for a number and followed 1,285 of the statistics they cited back to the source.
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Gemini 4 Carbon is the new #1 on the Artificial Analysis Intelligence Index v5
Google’s Gemini 4 Carbon is the new #1 on the Artificial Analysis Intelligence Index v5, and second only to Claude Opus 5.5 on the Artificial Analysis Coding Agent Index
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Twelve years of distributed SQLite
In September 2014 I published a short post announcing rqlite. The idea was simple: take SQLite, put a Raft log in front of it, and replicate every write to a cluster so that the loss of a node did not mean the loss of the data. The source went on GitHub that same weekend. As…
10
Can we replace a $150k Looker with a bucket of HTML files?
(BI) Software is dead, apparently
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UUIDv7: Timestamps aren’t time-ordered and other oddities
When timestamps aren’t time-ordered and other oddities
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DuckDB 2.0.0 LTS “Cinnamon Teal”
The DuckDB team is happy to announce that today we're releasing DuckDB version 2.0.0 LTS, codenamed “Cinnamon Teal” (Spatula cyanoptera). This is our biggest feature release so far, and it ships a polished version of the Quack protocol, asynchronous I/O, a first-class VARIANT type, agent mode, triggers, an extensible…
13
PingCap TiDB Leaks
PingCAP Inc. / TiDB Cloud • Distributed databases • 10.6 TB total exfiltration • 200 GB stage one release
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One Hash Bloom Filters
Jim Calabro
15
Ontology-Driven Observability: Building an End-to-End Knowledge Graph at Netflix
Prasanna Vijayanathan, Renzo Sanchez-Silva
16
Timestral: Mistral's time-series foundation models
State-of-the-art probabilistic forecasting in four sizes (5M–209M params), CPU-efficient, zero-shot ready.
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Postgres isn't slow, your storage is
A recap of Sai Srirampur's POSETTE 2026 talk on storage performance in Postgres, with a local NVMe vs. EBS benchmark and the production setup behind it.
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Why DuckDB 2.0 is faster
DuckDB 2.0 alpha vs 1.5.5 on one laptop: recursive CTEs up to 90x, VARIANT 6x faster than JSON text, async I/O 2.4x on S3. What changes, and how to model data to get the speedup. | Reading time: 15 min read
19
Can you use autoregressive diffusion to generate market data?
The following is part of a series of posts about 2026 summer intern projects – for more, see “What the interns have wrought, special jumbo 2026 edition”
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Polars 2.0
The release Python Polars 2.0, bringing the streaming engine, out-of-core and first class blazingly fast SQL support
21
Supabase is acquiring Turso
Supabase is acquiring Turso to build the database infrastructure for agentic AI
22
RIP, vector database
turbopuffer is pushing the frontier of search. To do that, we have to fundamentally redesign our storage architecture so the vector index is no longer primary.
23
Cloudflare K2: serverless event streams
Cloudflare K2 is a serverless event streaming service built directly on top of R2 object storage for high-scale data movement and long-term retention. By decoupling producers and consumers at the edge, K2 enables durable, ordered log streams without the operational overhead of traditional broker clusters.
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Backblaze drive stats for Q2 2026
Explore Q2 2026 failure rates across 354,415 Backblaze drives, plus standout models and emerging CMR, SMR, and HAMR storage technologies.
25
Language models for text classification: From bag-of-words to Jev
A Visual Guide to RNNs, CNNs, Transformers, and Calibration, with Hands-On Experiments on Accuracy and Efficiency
26
I could've accessed 17T Microsoft records
How one unchecked login token put 17 trillion rows in a Microsoft internal analytics service within reach.
27
Does Reddit have an astroturfing problem? What the data suggests
In 51,129 comments from six knife subreddits, the 5% most brand-heavy accounts wrote 11.3% of the brand mentions in buying threads, against 7.9% expected by chance. For one brand it is 31% against 8%. The full Reddit histories of those accounts are 4.5 years old and spread over 66 subreddits, the same as a comparison…
28
Footguns with Postgres “at time zone 'UTC'”
And why you may need to repeat AT TIME ZONE 'UTC' twice. SUMMARY * AT TIME ZONE 'UTC' converts the data type from timestamptz to timestamp (example). * Now you are inadvertently using the timestamp without time zone (aka timestamp) data type, which is markedly discouraged. * There are tons of footguns with timestamp…
29
Excel now supports multiple values in a single cell
Throughout Excel's 40-year history, you've only been able to put one value per cell. In this announcement, we're excited to share how that's changing with...
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Postgres SELECT DISTINCT Does Not Scale
Postgres SELECT DISTINCT performs surprisingly poorly. We explain why and how we mitigated it.