--- title: How ClickHouse became fast at joins | daily.dev description: Over two years of focused engineering, ClickHouse achieved a 26× speedup on join-heavy TPC-H SF100 workloads. The post details four key improvements: (1)... canonical: https://daily.dev/posts/how-clickhouse-became-fast-at-joins-lcg879zkp twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: How ClickHouse became fast at joins | daily.dev og:description: Over two years of focused engineering, ClickHouse achieved a 26× speedup on join-heavy TPC-H SF100 workloads. The post details four key improvements: (1)... og:url: https://daily.dev/posts/how-clickhouse-became-fast-at-joins-lcg879zkp og:image: https://api.daily.dev/og/posts/Lcg879ZKP.png og:image:alt: How ClickHouse became fast at joins og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # How ClickHouse became fast at joins **[ClickHouse](https://daily.dev/sources/clickhouse)** · 17 min read · 0 upvotes · 0 comments ## Summary Over two years of focused engineering, ClickHouse achieved a 26× speedup on join-heavy TPC-H SF100 workloads. The post details four key improvements: (1) correlated subquery decorrelation enabling previously unsupported SQL patterns, (2) lazy column replication that avoids physically copying repeated join values (1.9× faster), (3) runtime bloom filters that pre-filter probe-side rows before hash-table lookups (2.1× faster, 7× less memory), and (4) statistics-based join reordering that automatically selects optimal join plans — reducing a 6-table query from 3,903 seconds to 2.7 seconds (1,450× faster). Since 26.4, column statistics are generated automatically, making these optimizations effective with default settings. Year three is underway with distributed joins targeting TPC-H SF1000. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [What a difference 10 years of open source makes](https://daily.dev/posts/what-a-difference-10-years-of-open-source-makes-5trlytqlz) · ClickHouse · 2 upvotes · 0 comments - [ClickHouse Release 26.7](https://daily.dev/posts/clickhouse-release-26-7-8dsprk7ep) · ClickHouse · 3 upvotes · 0 comments - [TPC-H for less than a cent: ClickHouse Cloud vs. Snowflake, Databricks, BigQuery, and Redshift](https://daily.dev/posts/tpc-h-for-less-than-a-cent-clickhouse-cloud-vs-snowflake-databricks-bigquery-and-redshift-7g58szban) · ClickHouse · 0 upvotes · 0 comments --- Tags: [#backend](https://daily.dev/tags/backend), [#clickhouse](https://daily.dev/tags/clickhouse) [View this post on daily.dev](https://daily.dev/posts/how-clickhouse-became-fast-at-joins-lcg879zkp) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"How ClickHouse became fast at joins","url":"https://daily.dev/posts/how-clickhouse-became-fast-at-joins-lcg879zkp","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/how-clickhouse-became-fast-at-joins-lcg879zkp"},"datePublished":"2026-06-05T11:54:19.920Z","dateModified":"2026-06-05T11:54:43.909Z","description":"Over two years of focused engineering, ClickHouse achieved a 26× speedup on join-heavy TPC-H SF100 workloads. 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