sqlfluff-complexity 0.1.0

SQLFluff plugin for SQL and dbt model complexity rules

sqlfluff-complexity

SQLFluff rules and reports for finding SQL and dbt models that are too complex to review safely.

sqlfluff-complexity adds CPX rules to SQLFluff for CTE count, join count, nested subquery depth, CASE expressions, boolean predicates, window functions, and an aggregate weighted complexity score. The same metric engine also powers a companion sqlfluff-complexity report command for non-blocking console and SARIF reports.

Who It Is For

• Analytics engineers who want dbt models to stay small enough to review.
• Data platform teams that already run SQLFluff in local development or CI.
• Teams that want gradual complexity reporting before turning on strict lint failures.

Quick Start

Install the custom SQLFluff plugin in the same Python environment where you run SQLFluff:

pip install sqlfluff-complexity

If your project uses uv:

uv add --dev sqlfluff-complexity

Then enable CPX rules in .sqlfluff and run SQLFluff:

[sqlfluff]
dialect = postgres
rules = CPX_C101,CPX_C102,CPX_C103,CPX_C104,CPX_C105,CPX_C106,CPX_C201

sqlfluff lint models/

For a complete walkthrough, see docs/quickstart.md.

Documentation

• Quick start: install, configure, and run the first lint.
• Configuration: thresholds, aggregate weights, and path overrides.
• Rules reference: CPX rule codes and what each metric counts.
• Reporting: console and SARIF report mode.
• dbt usage: SQLFluff dbt templater compatibility and v1 boundaries.
• Dialects: tested dialects and dbt adapter mapping caveats.
• Docs index: all user, contributor, and design documents.

Project Status

• Native SQLFluff plugin rules and the companion report CLI are available in the package.
• v1 measures SQLFluff-parsed SQL; direct dbt manifest.json and DAG-level metrics are deferred.
• Architecture decisions are recorded in docs/adr/.

Development

Contributor setup, Nox sessions, fixture authoring, ADR workflow, and verifier guidance live in CONTRIBUTING.md. Agent-specific project instructions live in AGENTS.md.