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Renting a sewing machine from the library

https://www.bbc.com/future/article/20260618-the-weird-and-wonderful-libraries-of-finland
144•sohkamyung•5h ago•67 comments

Epoll vs. io_uring in Linux

https://sibexi.co/posts/epoll-vs-io_uring/
80•Sibexico•5h ago•22 comments

Show HN: TownSquare, a tiny presence layer for websites

https://townsquare.cauenapier.com/
105•cauenapier•16h ago•39 comments

Loupe – A iOS app that raises awareness about what native apps can see

https://github.com/mysk-research/loupe
118•Cider9986•16h ago•30 comments

Developers don't understand CORS (2019)

https://fosterelli.co/developers-dont-understand-cors
40•toilet•2h ago•15 comments

15-minute at-home Lyme disease tick test

https://www.bostonglobe.com/2026/06/17/business/lyme-disease-tick-test/
65•bookofjoe•2d ago•20 comments

Slow breathing modulates brain function and risk behavior

https://www.cell.com/neuron/fulltext/S0896-6273(26)00339-9
89•croes•5h ago•17 comments

Project Fetch: Phase Two

https://www.anthropic.com/research/project-fetch-phase-two
44•stopachka•4h ago•15 comments

SMPTE Makes Its Standards Freely Accessible

https://www.smpte.org/blog/smpte-makes-its-standards-freely-accessible-openingstandards-library-t...
241•zdw•11h ago•70 comments

When I reject AI code even if it works

https://vinibrasil.com/when-i-reject-ai-code-even-if-it-works/
76•vnbrs•3h ago•37 comments

UHF X11: X11 Built for VisionOS and Apple Vision Pro

https://www.lispm.net/apps/uhf-x11/
182•zdw•11h ago•32 comments

Unauthorized alert sent to cell phones across Brazil

https://www.cnn.com/2026/06/20/americas/brazil-hackers-unauthorized-alert-latam
101•zdw•8h ago•78 comments

Whole cross-sectional human ultrasound tomography

https://www.nature.com/articles/s41551-026-01660-4
46•lnyan•2d ago•6 comments

DOS Game "F-15 Strike Eagle II" reversing project needs DOS test pilots

https://neuviemeporte.github.io/f15-se2/2026/06/20/needyou.html
221•LowLevelMahn•13h ago•60 comments

Semiconductor Lifeline Keeps Fighter Jets in the Air

https://spectrum.ieee.org/phoenix-semiconductors-legacychips-oems
52•rbanffy•4d ago•16 comments

Alice is impatient

https://brooker.co.za/blog/2026/06/19/waiting.html
70•birdculture•7h ago•20 comments

PostgresBench: A Reproducible Benchmark for Postgres Services

https://clickhouse.com/blog/postgresbench
86•saisrirampur•9h ago•22 comments

NOLA 'Nacular: One man's crusade to preserve New Orleans's vernacular signage

https://countryroadsmagazine.com/art-and-culture/people-places/nola-nacular/
23•NaOH•4d ago•2 comments

Linux eliminates the strncpy API after six years of work, 360 patches

https://www.phoronix.com/news/Linux-7.2-Drops-strncpy
121•simonpure•7h ago•104 comments

Show HN: StartupWiki – A Free Alternative to Crunchbase

https://startupwiki.tech/
171•shpran•12h ago•57 comments

Guide to the TD4 4-bit DIY CPU

https://www.philipzucker.com/td4-4bit-cpu/
8•andrewstuart•2d ago•0 comments

Temporary Cloudflare accounts for AI agents

https://blog.cloudflare.com/temporary-accounts/
184•farhadhf•16h ago•101 comments

Inference cost at scale with napkin math

https://injuly.in/blog/napkin-inference-cost/index.html
64•gmays•4d ago•15 comments

The rise of South Korea’s weapons business

https://www.politico.com/news/magazine/2026/06/20/south-korea-weapons-dealer-trump-00959559
122•JumpCrisscross•16h ago•44 comments

The Wholesale Plagiarism of Obscure Sorrows

https://waxy.org/2026/06/the-wholesale-plagiarism-of-obscure-sorrows/
341•ridesisapis•10h ago•141 comments

Show HN: Make PDFs look scanned (CLI or in the browser via WASM)

https://github.com/overflowy/make-look-scanned
98•overflowy•9h ago•48 comments

Bun has an open PR adding shared-memory threads to JavaScriptCore

https://github.com/oven-sh/WebKit/pull/249
121•gr4vityWall•11h ago•235 comments

Supermarket giant Tesco sues VMware for breach of contract (2025)

https://www.theregister.com/software/2025/09/03/supermarket-giant-tesco-sues-vmware-for-breach-of...
109•wglb•7h ago•27 comments

White House delays US voting-machine vulnerability report

https://www.reuters.com/world/white-house-delays-release-us-voting-machine-study-midterms-near-20...
76•logickkk1•2h ago•58 comments

Show HN: We post-trained a model that pen tests instead of refusing

https://www.argusred.com/cli
77•dk189•14h ago•37 comments
Open in hackernews

Anatomy of a SQL Engine

https://www.dolthub.com/blog/2025-04-25-sql-engine-anatomy/
168•ingve•1y ago

Comments

jimbokun•1y ago
Very nice write up enumerating all the stages of SQL query execution. Interesting even if you don’t care about the DoIt database specifically.
Austizzle•1y ago
Man, this title tripped me up for a minute because I pronounce it with the letters like Ess-Queue-Ell

So the "A" in "A ess-queue-ell" engine felt like it should have been an "An" until I realized it was meant to be pronounced like "sequel"

perching_aix•1y ago
Not necessarily, I see native speakers completely ignore this a lot.

Have you ever considered pronouncing it as squirrel by the way?

kreetx•1y ago
Many (most?) non-native English speakers do pronounce it as ess-queue-ell, especially in their own languages, so yes, the use of "a" instead of "an" does look off from that perspective.
SloopJon•1y ago
When I read SQL for Dummies almost thirty years ago, it made a point of distinguishing "sequel" as a historical predecessor to standard "SQL." As I recall, the author even asserted that SQL is not an acronym/initialism for structured query language. I felt funny saying sequel for the next decade or so, because I wasn't an old timer experienced with this pre-SQL technology.

Now I usually say sequel because everyone else does. That and it rolls off the tongue better than S-Q-L.

jtolmar•1y ago
I prefer "ess queue ell" these days, but the first DBA I ever worked with pronounced it "squirrel".
gopalv•1y ago
This is a great write up about a pull-style volcano SQL engine.

The IR I've used is the Calcite implementation, this looks very concept adjacent enough that it makes sense on the first read.

> tmp2/test-branch> explain plan select count() from xy join uv on x = u;

One of the helpful things we did was to build a graphviz dot export for the explains plans, which saved us days and years of work when trying to explain an optimization problem between the physical and logical layers.

My version would end up displayed as SVG like this

https://web.archive.org/web/20190724161156/http://people.apa...

But the calcite logical plans also have that dot export modes.

https://issues.apache.org/jira/browse/CALCITE-4197

th0ma5•1y ago
This is really great!!
gavinray•1y ago
Calcite also has a relatively-unknown web tool for plan visualization that lets you step through execution.

It's a method from "RuleMatchVisualizer":

https://github.com/apache/calcite/blob/36f6dddd894b8b79edeb5...

Here's a screenshot of what the webpage looks like, for anyone curious:

https://github.com/GavinRay97/GraphQLCalcite/blob/92b18a850d...

ignoreusernames•1y ago
I recommend anyone who works with databases to write a simple engine. It's a lot simpler than you may think and it's a great exercise. If using python, sqlglot (https://github.com/tobymao/sqlglot) let's you skip all the parsing and it even does some simple optimizations. From the parsed query tree it's pretty straightforward to build a logical plan and execute that. You can even use python's builtin ast module to convert sql expressions into python ones (so no need for a custom interpreter!)
Abde-Notte•1y ago
Second this - building even a simple engine gives real insight into query planning and execution. Once parsing is handled, the core ideas are a lot more approachable than they seem.
albert_e•1y ago
Sorry for slight digression.

In a larger system we are building we need a text-to-sql capability for some structured data retrieval.

Is there a way one could utilize this library (sqlglot) to build a multi-dialect sql generator -- that is not currently solved by directly relying on a LLM that is better at code generation in general?

LtdJorge•1y ago
This is a SQL to X library, though. I don’t think it’s what you need.
gavinray•1y ago
You can use an LLM to generate query-builder expressions from popular libraries in whatever language.

For example, on the JVM there is jOOQ, which allows you to write something like:

  select(field("foo"), avg("bar")).from(table("todos"))
And then it will render dialect-specific SQL. It has very advanced emulation functionality for things like JSON aggregations and working around quirks of dialects.

Alternatively, you can ask an LLM to generate a specific dialect of SQL, and then use jOOQ to parse it to an AST, and then render it as a different dialect, like:

    val parser= DSL.using(SQLDialect.POSTGRES).parser()
    val parsedQuery = parser.parseQuery(postgresQuery)
    val renderedMySQL = DSL.using(SQLDialect.MYSQL).renderInlined(parsedQuery)
    println(renderedMySQL)
Unsure if functionality like this exists in other Query Builder libraries for other languages.
KyleBrandt•1y ago
Using dolthub's go-mysql-server for Grafana's upcoming SQL expressions feature (private preview in Grafana 12, but in the OSS version with a feature toggle).

GMS lets you provide your own table and database implementations, so we use GMS to perform SQL queries against Grafana's dataframes - so users can join or manipulate different data source queires, but we don't have to insert the data into SQL to do this thanks to GMS.

genai-analyst•1y ago
another digression here... sorry... i see you're trying to diy text-to-sql—at some point you're gonna hit a bunch of hiccups. like, the model writes a query that “almost” works but joins the wrong tables, or it assumes column names that don’t exist, or it returns the wrong agg because it misread the intent. and retries won’t always save you—it’ll just confidently hallucinate again.

we’ve been through all of that at wobby.ai we ended up building a system where the data team defines guardrails and reusable query templates, so the agent doesn’t just make stuff up. it can still handle user prompts, but within a safe structure. if you want to save yourself from debugging this stuff endlessly, might be worth checking out wobby.ai.