Gonzalo Ortiz Jaureguizar

I am a software engineer specialized in developing databases in Java. I love understanding how libraries and frameworks work under the hood and to design and implement high-performance systems. I have worked on prototypes such as ToroDB, the first Spanish database unicorn Devo and since 2022 I'm working at StarTree as an Apache Pinot contributor.

Sessions for 2026

Why Your SQL is Slow: Unmasking Hidden Performance Traps in Apache Pinot

This talk tackles a universal developer pain point: writing a "perfect" SQL query that runs inexplicably slowly. Using the Apache Pinot distributed database as a practical case study, I will demystify why this happens. The session dives into how developers unknowingly sabotage their own queries through subtle NULL semantics, innocent-looking functions, and ORM-generated code that breaks the relational algebra rules core to any modern optimizer. This is a highly practical, "code-and-consequences" session that will give attendees a new mental model for writing performant SQL that applies not just to Pinot, but to any database they use.