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Good CTE, Bad CTE
The planner treats CTEs very differently depending on how you write them. Here's what happens under the hood, version by version, through PostgreSQL 18.
New
The latest blog posts to take off on Hacker News. 5,961 posts.
4322
The curious case of retro demo scene graphics
The demo scene has a peculiar view on copyright . It roughly boils down to a system of effort - effort in ideas, effort in craft - where the scene polices itself and punishes sceners that steal outright from other sceners. Theft from the outside world, however, is often taken lightly - especially when it comes to…
4323
VHDL's Crown Jewel
How VHDL preserves determinism In this post, I would like to talk about VHDL’s crown jewel: how it preserves determinism in a concurrent language. Here is a figure of how it works:
4324
Copilot edited an ad into my PR
After a team member summoned Copilot to correct a typo in a PR of mine, Copilot edited my PR description to include and ad for itself and Raycast .
4325
New Apple Silicon M4 and M5 HiDPI Limitation on 4K External Displays
A regression in external display support on Apple Silicon M4/M5 generation chips prevents full HiDPI modes on 4K monitors, limiting users to either blurry non-HiDPI or reduced workspace HiDPI.
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Coding agents could make free software matter again
I've been vibe-coding a lot lately. Like, a lot a lot
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ChatGPT won't let you type until Cloudflare reads your React state
Edit April 2, 2026: I've been getting inbound interest from researchers wanting to run their own queries. The MCP integration I use for my own research lets you analyze live mobile telemetry continuously collected from real devices in the wild, directly from Claude. To access it reach out at
4329
The Cognitive Dark Forest
The open web with AIs is turning into a dark forest.
4330
More on Version Control
This may have some legs
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My MacBook keyboard is broken and it's insanely expensive to fix
The right arrow key on my Macbook Pro keyboard stopped working the other day. I say “stopped working”, but technically it works too well now, it is being pressed constantly, which makes the laptop pretty unusable.
4332
C++26 is done: ISO C++ standards meeting Trip Report
News flash: C++26 is done! 🎉 On Saturday, the ISO C++ committee completed technical work on C++26 in (partly) sunny London Croydon, UK. We resolved the remaining international comments on the C++26…
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Windows 95 defenses against installers that overwrite a file with an older one
A very primitive version of recovery.
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The rise and fall of IBM's 4 Pi aerospace computers: an illustrated history
The morning of April 12, 1981, 20 years to the day after Yuri Gagarin became the first person in space, the Space Shuttle thundered into the...
4335
The bot situation on the internet is worse than you could imagine
As you may know, on Glade Art we tend to take anti-bot measures very seriously; it is one of our topmost priorities to protect our fellow users from having t...
4336
Chess in SQL
What if I told you SQL could play chess? No JavaScript, no frameworks - just pure SQL rendering a full chess board in your browser.
4337
The True Shape of Io's Steeple Mountain
Popular images of the Jovian moon Io’s famed Steeple Mountain turn out to be misinformed. How the Inquisitive team figured that out, and what Steeple Mountain really looks like!
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Nitrile and latex gloves may cause overestimation of microplastics
Nitrile and latex gloves that scientists wear while they are measuring microplastics may lead to a potential overestimation of the tiny pollutants, according to a University of Michigan study.
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ESP32-S31: Dual-Core RISC-V SoC with Wi-Fi 6, Bluetooth 5.4, and Advanced HMI
ESP32-S31 delivers comprehensive multi-protocol connectivity, rich multimedia interfaces, and hardware-accelerated security for next-generation IoT applications.
4340
What category theory teaches us about dataframes
Every dataframe library ships with hundreds of operations. pandas alone has over 200 methods on a DataFrame. Is pivot different from melt? Is apply different from map? What about transform, agg, applymap, pipe? Some of these seem like the same operation wearing different hats. Others seem genuinely distinct. Without a…
4341
What if AI doesn't need more RAM but better math?
How TurboQuant compresses the KV cache without losing accuracy, and what that could mean for memory stocks
4342
A Recipe for Steganogravy
how to hide juicy data in plain sight
4343
A laser-based process that enables adhesive-free paper packaging
Paper packaging offers a number of advantages over its plastic counterparts: It has a high recycling rate, lower CO₂ emissions, and lower disposal costs. However, it cannot yet be sealed without adhesives or layers of plastic—a disadvantage for manufacturing and recycling processes. In the PAPURE project, four…
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From 300KB to 69KB per Token: How LLM Architectures Solve the KV Cache Problem
How the KV cache gives every AI conversation a physical weight in silicon, and what happens when the memory runs out.
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Bring Back MiniDV with This Raspberry Pi FireWire Hat
In my last post, I showed you to use FireWire on a Raspberry Pi with a PCI Express IEEE 1394 adapter. Now I'll show you how I'm using a new FireWire HAT and a PiSugar3 Plus battery to make a portable MRU, or 'Memory Recording Unit', to replace tape in older FireWire/i.Link/DV cameras. The alternative is an old used…
4346
CSS is DOOMed
Every wall, floor, barrel, and imp is a div — DOOM rendered entirely in CSS. Using 3D transforms, CSS math functions, @property, clip-path, anchor positioning, and SVG filters to build a fully playable 3D first-person shooter in the browser without Canvas or WebGL.
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The revenge of the data scientist
AI eval mistakes and the data science practices that fix them.
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The first 40 months of the AI era
Lzon.ca. A personal blog, by a programmer and IT expert.2026216 points144 commentsAI & Machine Learning details
A personal blog, by a programmer and IT expert. Essays, Articles, Guides, and Recipes. As well as Code, Quotes, and Links.
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TruffleRuby
TruffleRuby started as my internship project at Oracle Labs in early 2013. It is an implementation of the Ruby programming language on the JVM, using the Graal dynamic compiler and the Truffle AST interpreter framework . TruffleRuby can achieve peak performance well beyond that possible in JRuby at the same time as…
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Founder of GitLab battles cancer by founding companies
I’ve taken agency in the treatment of my bone cancer (osteosarcoma in the T5 vertebrae of the upper spine). After I ran out of standard-of-care treatment options and there were no trials available for…