arrow-lint 0.0.9

A fast, opinionated, extensible linter for Apache Arrow datasets and related formats.

arrow-lint

Sharpen your Arrow datasets.

ArrowLint is a fast, opinionated, extensible linter for Apache Arrow datasets and related formats. It provides quick local feedback, CI-friendly reports, and a rule system designed for the Arrow ecosystem.

Features

• Rust core engine with a common dataset model.
• Scanners for Parquet, Arrow IPC, and Feather.
• Python API and Python-first CLI.
• Native Rust CLI for direct integration.
• Built-in rules for schema consistency, metadata, row groups, statistics, compression, timestamp portability, dictionary encoding, and small files.
• JSON, SARIF, and human-readable reports.
• YAML declarative rules for simple metadata checks.
• Extension points for additional rule packs.

Supported Inputs

ArrowLint scans:

• Apache Parquet
• Apache Arrow IPC files
• Feather files

The project also defines extension boundaries for Iceberg, Vortex, Lance, and DuckDB-focused checks. These formats are represented in the format-pack registry so rule packs can share a consistent discovery and reporting model.

Installation

uv sync
uv run maturin develop

CLI

uv run arrow-lint lint path/to/dataset --config .arrowlint.yaml
uv run arrow-lint lint path/to/dataset --output json
uv run arrow-lint lint path/to/dataset --output sarif > arrowlint.sarif
uv run arrow-lint rules
uv run arrow-lint formats

There is also a native Rust binary:

cargo run -p arrowlint-cli -- lint path/to/dataset

Python API

from arrow_lint import lint

report = lint("path/to/dataset", config=".arrowlint.yaml")
for diagnostic in report["diagnostics"]:
    print(diagnostic["rule_id"], diagnostic["message"])

Configuration

ArrowLint reads YAML configuration:

scan:
  recursive: true

rules:
  min_row_group_rows: 100000
  small_file_bytes: 67108864
  fail_on: error
  disabled: []
  declarative_rule_files:
    - examples/rules/metadata.yaml

Declarative rules cover simple metadata checks:

rule: missing_crs
severity: warning
applies_to: parquet
check:
  metadata_key: crs

Architecture

Python API / CLI
        |
        v
PyO3 native module       Rust CLI
        |                   |
        +--------+----------+
                 v
          arrowlint-core
        /       |        \
 scanners  dataset model  rules
        \       |        /
              reports

The core crate owns scanning, diagnostics, rule execution, and rendering. The Python package is deliberately thin so plugin authors and data teams get a comfortable interface without compromising the Rust fast path.

Extension Strategy

The built-in engine focuses on common Arrow, Feather, and Parquet checks. The format pack registry defines stable boundaries for specialized rule packs:

• arrowlint-iceberg for manifests, snapshots, partition evolution, and delete files.
• arrowlint-vortex for array encodings, chunk sizing, and statistics.
• arrowlint-lance for fragments, indexes, schema evolution, and vector metadata.
• arrowlint-duckdb for Arrow export round-trips, nested types, timestamps, and writer settings.

Rule packs can start in this repository and move to separate packages when their public APIs are stable.

Development

cargo test
uv run maturin develop
uv run pytest
pre-commit run --all-files