Andrus Adamchik

Matches my experience

DFLib just got a parsable expression grammar. Those expressions can be thought of as parts of SQL for the purpose of column transformation, filtering and (soon) DataFrame sorting

github.com/dflib/dflib/...

Wow, just got a piece of decent code out of Gen AI - a deep clone method for an Open API descriptor tree. Still had to go line by line, adding missing properties, but the code was generally clean and meaningful. Unfortunately such success is a rare occasion

My first time at @lu.voxxeddays.com. Pretty exciting!

In the meantime, working on getting the next DFLib milestone out of the door with the new parser of SQL-like expressions, making expressions more readable compared to the current Java DSL

Just updated my Java dataframe test & benchmark. @andrus.adamchik.org contributed an implementation for DFLib, which is now the fastest Java dataframe (not counting @duckdb.org which is much faster, but doesn't give you the dataframe syntax)

github.com/mathijs81/ja...

The a5 version of the Jupyter kernel is officially released. Looking forward to feedback on the new Maven engine. I feel like adding a flag equivalent to "mvn -U" for snapshot refreshing may be the next logical step.

github.com/dflib/jjava/...

Request for name suggestions:
I am building a language to define data schema (similarly to what xsd and json-schema do) that is format independent, and thus it could be used to validate data serialized in multiple different formats.
It’s optimized for ergonomics, as I find current schema […]

Try googling (or whatever the term is for ChatGPT 🙂) for "Jupyter keyboard shortcuts". Notebook keyboard navigation is awesome and makes you very productive (inserting cells above and below, changing cell type between code and markdown, etc.)

The "TAB" key should do it.

Been testing the soon-to-be-released DFLib JJava Jupyter kernel v1.0-a5. No more Ivy there, just pure Maven. Makes dependency management so much more reliable.

Ok, the first version of the docs just got published at the link above.

Every 10-20 years, a breakthrough technology promises non-developers to finally create software without needing to hire programmers.

So far, every such technology resulted in the need for more devs… expert in this NEW technology (or knowing how to fix it up).

Every. Time.

Thanks! Yeah, we'll prioritize filling this gap in the docs. For now, look up the class called "Excel" and its static methods. E.g.:

// load all sheets
Map<String, DataFrame> data = Excel.load("my.xlsx");

// load a single sheet
DataFrame df = Excel.loadSheet("my.xlsx", "Sheet 1");

Back to the Future of Software: How to Survive AI with Intent Integrity Chain by Baruch Sadogursky Great Scott! The robots are coming for your job—and this time, they brought unit tests. Join Doc and Marty from the Software Future (Baruch and Leonid) as they race back in time to help you fight the ...

Enjoyed the closing keynote at @geecon.bsky.social by @jbaru.ch and Leonid Igolnik. They tried to envision an "enterprise" version of vibe coding (that's not how they worded it 🙂) Though futuristic, it came out rather convincing speaking.jbaru.ch/DVCzoZ/back-...

Today I learned that my position at Microsoft was discontinued, amongst many others. Please reach out if it makes sense for us to explore something new together. My bio is always up-to-date. reza-rahman.me/about/

Andrus Adamchik presenting DFLib in a Jupyter notebook in front of a screen

Tonight, @andrus.adamchik.org is giving us an overview of DFLib!

Server management approach is often described as "pets vs cattle". I think the same analogy might apply to data representation in apps: objects - "pets" 🐕, DataFrames - "cattle" 🐄 . Too brutal?

Very nice! I resisted the urge to make “$” a method name in DFLib for expression shortcuts, but here it looks very natural 🙂

Release Introducing JBang Jash · jbangdev/jbang-jash JBang Jash (pronounced Jazz, the music style) is a Java library to provide way to run process or shell scripts that is fluent, predictable and with a great developer experience. To use it add a dep...

Ever been annoyed with how complex it is to execute processes in Java and handle stdin, stdout and stderr?

Me too - so Introducing JBang Jash - github.com/jbangdev/jba...

DataFrame - A Swiss Army Knife of Java Data Processing, Wed, Apr 30, 2025, 5:30 PM | Meetup **Note:** Slightly earlier start time than usual! Let us know how you feel about 5:30pm vs 6:00pm start times! **Abstract** When implementing an ETL job, doing data analys

Join us on April 30, 2025 at Deutsche Bank to see @andrus.adamchik.org give a talk on DataFrame!

www.meetup.com/triangle-jav...

Just published DFLib (#java DataFrame library) v1.3.0. This is a backwards-compatible maintenance release with a number of bug fixes, new statistical expressions, and an optimized vConcat operation github.com/dflib/dflib/...

#JAlba is happening again in 3 months, registration is open! It will be our 6th edition, don't miss out on attending the #Java #unconference in Edinburgh Scotland, created on the model of #JCrete. Come and meet #Java champions and experts. Register now: jalba.scot

Just installed the newest toy - Claude Code. I like their CLI-first IDE-agnostic approach and decent “understanding” of your code base, but there are no miracles. It can can help with refactoring here and there, but it fails at “real” coding tasks.

When iPhones first came out there were people bragging about writing novels on an iPhone 🤷‍♂️

“Hu said that even if product builders rely heavily on AI, one skill they would have to be good at is reading the code and finding bugs”

Which will take more time than writing correct code from scratch

That’s assuming human developers catch up with all the new stuff in each Java version 🙂

Welcome @devnexus.bsky.social crew 🍑! Celebrating w @andrus.adamchik.org @jerdog.dev at Park Bar

DevNexus is off to a great start! 🙂

This is where we need to improve Java DFLib charts. They show up beautifully in regular Jupyter, but GitHub notebook renderer prevents JS execution. So server-side chart creation will be needed