ClickHouse

pg_clickhouse v0.10, released August 11, 2026, finally pushes correlated subqueries (SubPlans) down into ClickHouse, moving the TPC-H scoreboard from 12 to 16 of 22 queries fully pushed down. The headline result is TPC-H Q17, which dropped from 32.7 seconds to 37 milliseconds — roughly 880x faster and beating native PostgreSQL’s 2.1 seconds. This guide explains how subquery pushdown works, how to verify it with EXPLAIN, and what you need to upgrade to take advantage of it. ...

On January 16, 2026, ClickHouse announced it had acquired Langfuse — the most widely deployed open-source LLM observability platform — alongside a $400M Series D that tripled ClickHouse’s valuation to $15 billion. The MIT license stays intact, self-hosting remains a first-class option, and the Langfuse roadmap is unchanged. But this acquisition reshapes the competitive landscape for LLM monitoring in ways worth understanding before you commit to a toolchain. What Is Langfuse? A Quick Primer on the Platform Langfuse is an open-source LLM engineering platform that lets developers trace, evaluate, and debug AI applications in production. Founded in 2023 by Marc Klingen, Maximilian Deichmann, and Clemens Rawert as a Y Combinator W23 company, Langfuse grew from a debugging tool into a full-stack observability platform covering tracing, prompt management, evaluation pipelines, and a dataset playground for regression testing. By the end of 2025, Langfuse had over 20,000 GitHub stars, 26 million SDK installs per month, and was processing data for 2,300+ companies and billions of observations per month — a scale that few open-source AI infrastructure projects achieve in under three years. ...