soda-checks

Overview

SodaCL (Soda Checks Language) is a YAML-based domain-specific language for data reliability. A typical Soda project ships two YAML files - configuration.yml (data source connection) and checks.yml (assertions) - and runs them through the soda scan CLI (sodacl-overview (opens in new window), sodacl-quickstart (opens in new window)).

This skill covers SodaCL authoring, scan configuration, running, and CI integration. Use it when you want YAML-only assertions on warehouse tables without writing Python (in contrast to Great Expectations, which is Python-first) or compiling a dbt project.

When to use

• The repo has configuration.yml + checks.yml (the canonical Soda filenames per sodacl-quickstart (opens in new window)).
• The user asks about checks for <table>:, missing_count, duplicate_count, freshness, or invalid_count - SodaCL check types per sodacl-overview (opens in new window).
• A pipeline needs warehouse-side data quality with no programmatic glue: SQL warehouses (Snowflake, BigQuery, Postgres, Redshift) are first-class data sources.
• A team uses Soda Cloud for cross-team observability of scan results.

Authoring checks

File shape

checks.yml is a list of checks for <dataset>: blocks. Each block lists assertions in SodaCL syntax (sodacl-overview (opens in new window)):

# checks.yml
checks for orders:
  - row_count between 1 and 10000000
  - missing_count(order_id) = 0
  - duplicate_count(order_id) = 0
  - invalid_percent(email) < 1 %:
      valid format: email
  - freshness(updated_at) < 1d

checks for customers:
  - row_count > 0
  - missing_count(customer_id) = 0
  - schema:
      warn:
        when required column missing: [created_at]
      fail:
        when forbidden column present: [pii_ssn, pii_dob]

Common check types

The check vocabulary in SodaCL (sodacl-overview (opens in new window)):

Thresholds and severity

Thresholds use comparison operators inline with the check (< 1%, between 10 and 1000, = 0). The schema check supports explicit warn: and fail: alert configurations to differentiate severity (sodacl-overview (opens in new window)):

checks for transactions:
  - schema:
      warn:
        when required column missing: [updated_at]
      fail:
        when forbidden column present: [pii*]

For non-schema checks, alert configurations apply via the alert configurations: syntax - see Soda's optional-config docs at https://docs.soda.io/soda-v3/sodacl-reference/optional-config.md for the full grammar.

Configuration

configuration.yml defines one or more data sources and (optionally) Soda Cloud credentials. Use environment-variable substitution for secrets - Soda expands ${ ENV_VAR } at scan time (quick-start-dev (opens in new window)):

# configuration.yml
data_source warehouse:
  type: snowflake
  username: ${ SNOWFLAKE_USER }
  password: ${ SNOWFLAKE_PASS }
  account: ${ SNOWFLAKE_ACCOUNT }
  database: analytics
  warehouse: compute_wh
  role: analyst
  schema: public

soda_cloud:
  host: cloud.us.soda.io
  api_key_id: ${ SODA_CLOUD_API_KEY }
  api_key_secret: ${ SODA_CLOUD_API_SECRET }

The soda_cloud: block is optional - omit it for a fully local scan.

Running

Canonical CLI invocation (sodacl-quickstart (opens in new window)):

soda scan -d warehouse -c configuration.yml checks.yml

Where:

• -d warehouse matches the data_source <name>: key in configuration.yml.
• -c configuration.yml points at the connection file.
• The trailing positional argument is the checks file (you can pass multiple).

Multiple checks files run in one scan:

soda scan -d warehouse -c configuration.yml \
  checks/orders.yml checks/customers.yml checks/transactions.yml

Each scan produces a checks pass/fail summary in stdout and (when soda_cloud: is configured) reports to Soda Cloud.

Parsing scan results

A failing scan exits non-zero and prints a per-check pass/fail line. For machine consumption, the Soda GitHub Action (opens in new window) converts scan results to a markdown table and posts the findings as a PR comment (quick-start-dev (opens in new window)). For other CI systems, parse stdout with the filtering snippet below.

# Capture and filter the scan output
soda scan -d warehouse -c configuration.yml checks.yml | tee scan.log

# Surface failing checks for the PR comment / job summary
grep -E '^\s*FAIL' scan.log || echo "All checks passed"

Note: if your team needs structured (JSON) scan output for richer downstream reporting, check the current soda scan flag set on https://docs.soda.io/ - flag availability evolves between major Soda Library / Soda Core versions.

CI integration

The minimal pattern is: install the Soda library + warehouse adapter, run soda scan, exit non-zero on failure, upload the scan log as an artifact.

# .github/workflows/soda-scan.yml
name: soda

on:
  pull_request:
  push:
    branches: [main]

jobs:
  soda-scan:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v5

      - uses: actions/setup-python@v5
        with:
          python-version: '3.12'

      - name: Install Soda + adapter
        # Pin versions; Soda Library has both a free OSS and commercial track.
        run: pip install 'soda-core' 'soda-core-snowflake'

      - name: Run scan
        env:
          SNOWFLAKE_USER:    ${{ secrets.SNOWFLAKE_USER }}
          SNOWFLAKE_PASS:    ${{ secrets.SNOWFLAKE_PASS }}
          SNOWFLAKE_ACCOUNT: ${{ secrets.SNOWFLAKE_ACCOUNT }}
        run: |
          soda scan -d warehouse -c configuration.yml checks.yml | tee scan.log

      - name: Upload scan log
        if: always()
        uses: actions/upload-artifact@v4
        with:
          name: soda-scan-log
          path: scan.log
          retention-days: 14

The if: always() on the artifact upload is required to capture the log on a failed scan - when you most need it for triage. For a managed GitHub-Action wrapper that auto-comments on PRs, see the Soda GitHub Action (opens in new window).

References

• sodacl-overview (opens in new window) - SodaCL concept overview, common check types, threshold syntax.
• sodacl-quickstart (opens in new window) - quickstart with canonical CLI invocation and default filenames.
• quick-start-dev (opens in new window) - configuration.yml shape, env-var substitution, CI-flow example.
• Soda GitHub Action (opens in new window) - first-party CI-action wrapper.