Defines operations, typed inputs and outputs, authorization context, errors, compatibility, and limits for clickhouse analytics connector, so adopters can execute compiled metric plans against ClickHouse through a least-privilege, bounded, observable analyt...
Package status: reference context ready for human review. The contract and test scenarios are complete, but no claim is made that an adopting implementation has passed them.
Decision
For ClickHouse analytics connector, define a closed, versioned interface contract so adopters can execute compiled metric plans against ClickHouse through a least-privilege, bounded, observable analytical adapter. The connector receives an internal compiled plan from the gateway; it is never a public or model-facing general SQL endpoint. This is a reference contract: database products, numeric budgets, jurisdictions, retention, organizational defaults, and accountable owners remain explicit adoption choices.
Scope
- The ClickHouse analytics connector actors, inputs, outputs, states, versions, and externally visible outcomes needed to execute compiled metric plans against ClickHouse through a least-privilege, bounded, observable analytical adapter.
- The role-specific focus of this block: define a closed, versioned interface contract, including primary, cached, asynchronous, export, support, and recovery paths where applicable.
- Adoption-specific configuration, ownership, rollout, evidence retention, and review responsibilities needed to use the contract safely.
Outside this block
- The connector receives an internal compiled plan from the gateway; it is never a public or model-facing general SQL endpoint.
- Choosing a universal database, model, renderer, vendor, numeric threshold, retention period, timezone, jurisdiction, or service-level objective.
- Claiming that packaged scenarios ran against a downstream implementation or that this reference grants security, privacy, accessibility, analytical, or legal approval.
Contract
- The declared ClickHouse analytics connector contract requires this rule: The service identity receives only the minimum SELECT privileges on curated analytical objects and no DDL, INSERT, ALTER, DROP, system administration, file, URL, or executable table functions.
- The declared ClickHouse analytics connector contract requires this rule: An enforced read-only profile, row policies where applicable, network restrictions, secret isolation, and gateway authorization provide independent layers of control.
- The declared ClickHouse analytics connector contract requires this rule: The adapter accepts a typed internal plan whose identifiers map through an allowlist; values use parameter binding and no model-authored text is concatenated into SQL.
- The declared ClickHouse analytics connector contract requires this rule: Every query receives bounded execution time, rows and bytes read, memory, concurrency, result rows and bytes, and distributed-work limits appropriate to its budget class.
- The declared ClickHouse analytics connector contract requires this rule: A correlation-safe query ID connects gateway request, ClickHouse query log, cancellation, resource accounting, result, and incident evidence.
- The declared ClickHouse analytics connector contract requires this rule: Queries target versioned semantic views or aggregates; source schema changes cannot silently change a public metric definition.
- The declared ClickHouse analytics connector contract requires this rule: Replica choice, freshness watermark, mutation lag, approximate functions, sampling, and partial distributed results are declared in the returned quality contract.
- The declared ClickHouse analytics connector contract requires this rule: Database exceptions map to stable gateway errors and redact SQL text, object names, addresses, credentials, and unrelated tenant details.
Implementation guidance
- Design operations around stable domain intent instead of exposing database or vendor primitives to callers.
- Use closed schemas, canonical identifiers, explicit version negotiation, and stable error codes at the public boundary.
- Document which identity and authorization facts come from trusted context and which fields are only untrusted request parameters.
- Provide compatibility fixtures for every supported client, connector, and result-schema version.
Failure handling and safeguards
- For ClickHouse analytics connector, Any attempt to use an unapproved object, function, setting, statement class, or budget is denied before dispatch and recorded safely.
- For ClickHouse analytics connector, Timeout, memory exhaustion, cancelled query, unavailable shard, stale replica, or partial result cannot be returned as a complete successful metric.
- For ClickHouse analytics connector, If cancellation cannot be confirmed, the connector marks execution uncertain and operations can locate the query by its durable query ID.
Verification and operations
- For the api evidence of ClickHouse analytics connector, inspect effective ClickHouse grants and settings in the target environment and prove that write, DDL, filesystem, network, and administrative statements fail.
- For the api evidence of ClickHouse analytics connector, fuzz compiled identifiers and values, run high-cardinality and distributed fixtures, and verify every resource limit and cancellation path.
- For the api evidence of ClickHouse analytics connector, compare connector results with frozen metric fixtures and monitor latency, rows and bytes read, memory, failures, freshness, and cache behavior by metric version.
Adoption assumptions
- The adopting product has authenticated identity, a versioned authorization policy, owned metric definitions, bounded telemetry, and a controlled path for change.
- Names and values in the example are fictional adoption fixtures, not universal defaults, production credentials, performance promises, or business targets.
- Referenced specifications constrain protocol, security, accessibility, or vendor behavior; the adopting team must confirm current applicability before promotion.
The executable-looking examples in this package are fixtures and acceptance contracts. Run the collection validator to check structure and metadata, then translate and execute the scenarios in the target repository before recording implementation evidence.
References
- ClickHouse documentation, Access rights (applies as of 2026-09-12)
- ClickHouse documentation, Restrictions on query complexity (applies as of 2026-09-12)
- ClickHouse documentation, CREATE ROW POLICY (applies as of 2026-09-12)