Jelte Fennema-Nio
@JelteF
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Software Engineer at MotherDuck (ex-Microsoft) & Postgres contributor.
Amsterdam
Joined September 2011
Not about tech this time: I recently donated some of my stem cells to a patient with blood cancer, who I don't know, somewhere in the world. You too can register yourself to save a life: NL= USA= and Google for other countries
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I did a talk about the main project I've been working on for the past year: "pg_duckdb". So if you're curious what that is, give it a watch: #posetteconf
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RT @PosetteConf: 🎸 Tune in to (@JelteF) Jelte Fennema-Nio's talk during #PosetteConf Livestream 2️⃣ to learn about the new pg_duckdb open-s….
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Just finished recording my talk for POSETTE about pg_duckdb. You can watch the live stream together with me on June 11th. Because it's recorded I'll be able to constantly answer questions during the stream. More info:
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Today I finally tried out the new "Instant SQL" feature that @hamiltonulmer has been teasing for months. The immediate feedback really feels like MAGIC. For more fancy GIFs check out todays release blogpost: Be sure to try it out, you won't wanna go back
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PgBouncer 1.24.1 is out. It fixes CVE-2025-2291, which allowed expired passwords to still be accepted. It also fixes a few issues introduced in 1.24.0.
github.com
2025-04-16 - PgBouncer 1.24.1 - "CVE-2025-2291 VALID UNTIL yesterday" Security Fix CVE-2025-2291: Previously PgBouncer did not take into account the VALID UNTIL of a user password ...
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pg_duckdb 0.3 was just released! Major features include: Support for using PG indexes, a much easier syntax for querying parquet/csv/iceberg files in blob storage, and last but not least: ✨A shiny new logo✨.Changelog at:
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I had a great discussion with @thegeeknarrator about putting DuckDB into Postgres using pg_duckdb. You can watch it here:
Just released the episode on pg_duckdb with @JelteF on The GeekNarrator. If you love #Postgres or #DuckDb or just #DatabaseInternals, this episode will be interesting for you. Give it a watch here and learn, how DuckDB can make your Postgres better.
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PgBouncer 1.24.0 is out, with many improvements. And prepared statement support is now turned on by default!
github.com
2025-01-10 - PgBouncer 1.24.0 - "New year, new bouncer" Features Add support for Type=notify-reload for systemd. This requires systemd version 253 or later. (#1148) Add KILL_CLIENT...
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It was lots of fun talking about pg_duckdb on @PostgresFM.
New episode: "pg_duckdb". Michael and Nikolay are joined by @JoeSciarrino and @JelteF to discuss pg_duckdb — what it is, how it started, what early users are using it for, and what they're working on next. 🎧 📺
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pg_duckdb v0.2.0 is out: Now with Delta Lake, JSON, Azure and transaction support
github.com
pg_duckdb is a Postgres extension that embeds DuckDB's columnar-vectorized analytics engine and features into Postgres. We recommend using pg_duckdb to build high performance analytics and data...
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I've been bashing DuckDB and Postgres together for the past three months. It has been very challenging, but also extremely fun. There's sooo much more to do. But it's already extremely fast for some queries. So here's a v0.1.0 release. Try it out and please report any bugs.
Postgres analytics 10x faster with just an extension?!. Check out our first release of pg_duckdb, an open-source PostgreSQL extension by @hydradatabase & MotherDuck. It's already packed with awesome features! 👀.
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I'm now officially listed as a PostgreSQL contributor 🎉
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There's about a 1 in 50000 chance that your genetics match with the patient in such a way that you can be a donor. I signed up ~8 years ago and suddenly heard back a while ago. But that does mean that they need many people to sign up to be able to help all patients.
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Finally the side-project I created ~8.5 years ago to auto-generate boring code has reached version 1.0.0 With 150k+ repos using one of the previous versions I'm happy to be helping lazy devs like myself everywhere. #derive_more #rustlang.
github.com
derive_more is a library that adds derives for many of the standard library traits. By using this library the following code just works: use derive_more::{Add, Display, From, Into}; #[derive(Parti...
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In ~20 minutes my talk on prepared statements and connection poolers is starting at @PosetteConf. Go watch it live here: And if you miss it, you can ofcourse watch the recording on that same website later
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I just gave a talk at #PGConfdev about the Postgres Protocol. Recordings will be available at some point in the future.
Such a privilege to work with #PostgreSQL & #PgBouncer & Citus contributor @JelteF who is on stage now #PGConfdev giving a super cool talk (where he tells us what he really thinks) about “The Postgres Protocol: The Good, The Bad and The Future” //cc @AzureDBPostgres
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I was recorded for a podcast!.
Alongside his peers studying Systems Network Engineering, @JelteF unearthed a Postgres security vulnerability. Nowadays, he is a Principal Software Engineer at Microsoft working on Citus, Postgres, and PgBouncer.
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