ClickHouse

A Rust-native Delta Lake integration and SQL-powered charting in ClickStack landed in 26.5, building on 26.4's Arrow Flight SQL and AI functions.¹

Delta Lake rewrites under the hood. The native Delta Lake implementation was replaced with the Rust Delta Kernel, adding write support, schema evolution, time travel, and partition pruning while cutting maintenance overhead.²

ClickStack gained SQL-based charting and alerting. Queries now drive anomaly detection and rolling baselines directly on ClickHouse, without external tooling.³

clickhousectl v0.2.0 broadens its surface. The CLI added Postgres management, ClickPipes control, SQL over HTTP, and a standalone Rust client library for the Cloud API — alongside a getting-started guide and a version-comparison workflow.⁴

Core additions from 26.4 remain active. Arrow Flight SQL enables high-speed columnar transfer over gRPC. Four AI functions — aiGenerate, aiClassify, aiExtract, aiTranslate — let SQL queries call OpenAI and Anthropic endpoints directly. Grace hash join now spills to disk automatically when memory limits are hit. Text index reached GA.⁵

Cloud infrastructure continued to expand. The Google Cloud fleet migrated to Axion C4A processors (30–55% faster ClickBench, ~15% fewer compute credits).⁶ Index sharding distributes skip indexes across replicas instead of duplicating them per node.⁷ ClickPipes Terraform and OpenAPI reached GA.⁸ Postgres Query Insights — ranking every query pattern by impact with diagnostic context — entered preview.⁹

pg_clickhouse added JSONB, date/time, and array function pushdown plus HTTP result set streaming.¹⁰