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Optimising ClickHouse and HogQL queries v1.0.0

Use this resource to optimise a HogQL or ClickHouse query that is too slow

New

  • 453 downloads
  • 250 likes
  • 148 saves

Free

Install with the CLI

In a terminal, from the folder you want:

npx --yes palatekit@latest install clickhouse-hogql-query-optimization

With no option, the skill goes to ~/.agents/skills/; add --agent claude-code (or codex, cursor…) to target an agent.

First time: connect the CLI with

npx --yes palatekit@latest login

The agent extracts the ClickHouse SQL the query produces, scans for common smells (FROM ... FINAL, JSONExtract over properties, missing skip indexes, self-joins), measures on a real cluster, then applies the fix at the right layer: printer, query runner or migration.

Mostly picked by

Updated November 2, 2026

Card for the “Optimising ClickHouse and HogQL queries” skill

Details

Works in
Install guides
Generates with
Your agent's model
Licence
MIT

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What you get

  • SKILL.md: fix layer, SQL extraction and common smells
  • references/: investigation playbook and lessons learned

Good fit for

  • An insight query hits a timeout or memory limit
  • You review a proposed HogQL printer change

Not for

    Tags

    • clickhouse
    • hogql
    • optimisation
    • queries

    About

    You say

    “This HogQL report takes thirty seconds. Find out what slows it down.”

    Card for the “Optimising ClickHouse and HogQL queries” skill

    Skill published by posthog under the MIT license, delivered in its original version.

    Show more

    How to use it

    1. Install the skill in your agent's skills folder
    2. Ask your agent to optimise a HogQL or ClickHouse query that is too slow
    3. Review and adjust the result

    Content preview

    Files

    • LICENSE1.5 KB
    • NOTICE-PALATEKIT.md0.5 KB
    • references/investigation-playbook.md13.5 KB
    • references/learnings.md28 KB
    • SKILL.md22.5 KB

    Origin and licence

    Listed unmodified

    Author
    posthog
    Source
    github.com/posthog/posthog/tree/fcb362bb439b15171da4dfba401bff03ea98bd2b/.agents/skills/optimizing-clickhouse-and-hogql-queries
    Licence
    MIT

    Notice

    « optimizing-clickhouse-and-hogql-queries » (posthog, MIT) livré dans sa version d'origine : fiche en français et en anglais par PalateKit.

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