Day 17 of #100DaysOfClickHouse: Mastering Data Filtering for Faster ClickHouse Q

<p>A simple SQL suddenly triggers a full table scan, or a JOIN order looks completely off. Most of the time, the culprit is stale statistics misleading the optimizer. This guide

<h2> Introduction </h2> <p>When people first start using ClickHouse®, most of the attention naturally goes to the <strong>MergeTree</strong> engine. It's the default choice for

<p>ClickHouse JOIN performance was rebuilt between 2022 and 2026. The "avoid JOINs in ClickHouse" advice from 2020 is still circulating:</p> <blockquote> <p>"ClickHouse can't do