Big Data Technology & Architecture

Mar 30, 2022 · Databases

Understanding ClickHouse AggregatingMergeTree, AggregateFunction, and Materialized Views

This article explains how ClickHouse's AggregatingMergeTree engine uses the special AggregateFunction data type to pre‑aggregate data, demonstrates table creation, data insertion, and querying with state and merge functions, and shows how to combine it with materialized views for efficient analytics.