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Live: Artemis II Launch Day Updates

https://www.nasa.gov/blogs/missions/2026/04/01/live-artemis-ii-launch-day-updates/
750•apitman•11h ago•689 comments

Quantum computing bombshells that are not April Fools

https://scottaaronson.blog/?p=9665
83•Strilanc•4h ago•16 comments

A new C++ back end for ocamlc

https://github.com/ocaml/ocaml/pull/14701
134•glittershark•5h ago•8 comments

Steam on Linux Use Skyrocketed Above 5% in March

https://www.phoronix.com/news/Steam-On-Linux-Tops-5p
76•hkmaxpro•1h ago•31 comments

EmDash – A spiritual successor to WordPress that solves plugin security

https://blog.cloudflare.com/emdash-wordpress/
512•elithrar•12h ago•362 comments

The Claude Code Leak

https://build.ms/2026/4/1/the-claude-code-leak/
37•mergesort•2h ago•15 comments

DRAM pricing is killing the hobbyist SBC market

https://www.jeffgeerling.com/blog/2026/dram-pricing-is-killing-the-hobbyist-sbc-market/
373•ingve•7h ago•308 comments

Fast and Gorgeous Erosion Filter

https://blog.runevision.com/2026/03/fast-and-gorgeous-erosion-filter.html
104•runevision•1d ago•13 comments

Show HN: Git bayesect – Bayesian Git bisection for non-deterministic bugs

https://github.com/hauntsaninja/git_bayesect
238•hauntsaninja•4d ago•33 comments

AI for American-produced cement and concrete

https://engineering.fb.com/2026/03/30/data-center-engineering/ai-for-american-produced-cement-and...
172•latchkey•11h ago•109 comments

Your sign-up form is a weapon

https://bytemash.net/posts/subscription-bombing-your-signup-form-is-a-weapon/
4•homelessdino•38m ago•0 comments

What Gödel Discovered (2020)

https://stopa.io/post/269
7•qnleigh•2d ago•0 comments

Set the Line Before It's Crossed

https://nomagicpill.substack.com/p/set-the-line-before-its-crossed
49•surprisetalk•2d ago•23 comments

Signing data structures the wrong way

https://blog.foks.pub/posts/domain-separation-in-idl/
86•malgorithms•8h ago•40 comments

Ask HN: Who is hiring? (April 2026)

220•whoishiring•13h ago•182 comments

The revenge of the data scientist

https://hamel.dev/blog/posts/revenge/
120•hamelsmu•4d ago•24 comments

Show HN: Dull – Instagram Without Reels, YouTube Without Shorts (iOS)

https://getdull.app
64•kasparnoor•7h ago•43 comments

Trinity Large Thinking

https://openrouter.ai/arcee-ai/trinity-large-thinking
21•kristianp•2h ago•8 comments

IPv6 address, as a sentence you can remember

https://sentence2ipv6.tib3rius.com/
45•LorenDB•5h ago•57 comments

Weather.com/Retro

https://weather.com/retro/
65•typeofhuman•2h ago•15 comments

SpaceX files to go public

https://www.nytimes.com/2026/04/01/technology/spacex-ipo-elon-musk.html
261•nutjob2•10h ago•324 comments

InspectMind AI (YC W24) Is Hiring

https://www.ycombinator.com/companies/inspectmind-ai/jobs/jQNra64-software-engineer-build-the-wor...
1•aakashprasad91•7h ago

The Windows equivalents of the most used Linux commands

http://techkettle.blogspot.com/2026/04/the-windows-equivalents-of-most-used.html
33•elsadek•6h ago•16 comments

Scientists crack a 20-year nuclear mystery behind the creation of gold

https://www.sciencedaily.com/releases/2026/03/260313002633.htm
67•prabal97•9h ago•30 comments

Solar Balconies Take Europe by Storm

https://hackaday.com/2026/03/31/solar-balconies-take-europe-by-storm/
39•lxm•2h ago•10 comments

StepFun 3.5 Flash is #1 cost-effective model for OpenClaw tasks (300 battles)

https://app.uniclaw.ai/arena?tab=costEffectiveness&via=hn
153•skysniper•12h ago•66 comments

Ariane 6 user's manual [pdf]

https://www.ariane.group/app/uploads/sites/4/2024/10/Mua-6_Issue-2_Revision-0_March-2021.pdf
54•matthieu_bl•4d ago•11 comments

Escaping the Ogallala Trap

https://worksinprogress.co/issue/escaping-the-ogallala-trap/
6•surprisetalk•2d ago•8 comments

SolveSpace (open source 2D/3D CAD) working on Windows 2000 (2025)

https://github.com/solvespace/solvespace/issues/1036
27•ruevs•6h ago•4 comments

Jax's true calling: Ray-Marching renderers on WebGL

https://benoit.paris/posts/jax-ray-marcher/
69•BenoitP•9h ago•9 comments
Open in hackernews

Anatomy of a SQL Engine

https://www.dolthub.com/blog/2025-04-25-sql-engine-anatomy/
168•ingve•11mo ago

Comments

jimbokun•11mo 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•11mo 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•11mo ago
Not necessarily, I see native speakers completely ignore this a lot.

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

kreetx•11mo 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•11mo 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•11mo ago
I prefer "ess queue ell" these days, but the first DBA I ever worked with pronounced it "squirrel".
gopalv•11mo 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•11mo ago
This is really great!!
gavinray•11mo 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•11mo 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•11mo 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•11mo 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•11mo ago
This is a SQL to X library, though. I don’t think it’s what you need.
gavinray•11mo 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.
genai-analyst•10mo 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.

KyleBrandt•11mo 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.