Teradata Run Query in a Session

arazzo: 1.0.1
info:
  title: Teradata Run Query in a Session
  summary: Pick an available Vantage system, open a session, run a SQL query, and close the session.
  description: >-
    The canonical Teradata Query Service pattern for application integration.
    The workflow first discovers which Vantage systems are available for query
    execution, opens a new query session against the requested system, executes
    a SQL statement inside that session, and then closes the session to release
    resources. Each step spells out its request inline so the flow can be read
    and executed without opening the underlying OpenAPI description.
  version: 1.0.0
sourceDescriptions:
- name: queryServiceApi
  url: ../openapi/teradata-query-service-api.yaml
  type: openapi
workflows:
- workflowId: run-query-session
  summary: Open a session on a Vantage system, run one SQL query, then close the session.
  description: >-
    Lists the query systems to confirm the target is available, creates a
    session for the supplied user and database, executes the SQL statement, and
    deletes the session when finished.
  inputs:
    type: object
    required:
    - system
    - username
    - query
    properties:
      system:
        type: string
        description: Target Vantage system name (e.g. vantage-prod).
      username:
        type: string
        description: Database username used to open the session.
      database:
        type: string
        description: Default database for the session.
      query:
        type: string
        description: SQL statement to execute.
      maxRows:
        type: integer
        description: Maximum number of rows to return.
  steps:
  - stepId: listSystems
    description: >-
      Retrieve the Vantage systems available for query execution so the caller
      can confirm the requested system is reachable before opening a session.
    operationId: listQuerySystems
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      systems: $response.body
  - stepId: openSession
    description: >-
      Create a new query session against the requested system for the supplied
      user and default database.
    operationId: createSession
    requestBody:
      contentType: application/json
      payload:
        system: $inputs.system
        username: $inputs.username
        database: $inputs.database
    successCriteria:
    - condition: $statusCode == 201
    outputs:
      sessionId: $response.body#/sessionId
      sessionStatus: $response.body#/status
  - stepId: runQuery
    description: >-
      Execute the supplied SQL statement inside the open session and capture the
      query identifier, status, and returned rows.
    operationId: executeQuery
    requestBody:
      contentType: application/json
      payload:
        sessionId: $steps.openSession.outputs.sessionId
        query: $inputs.query
        format: json
        maxRows: $inputs.maxRows
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      queryId: $response.body#/queryId
      queryStatus: $response.body#/status
      rowCount: $response.body#/rowCount
      rows: $response.body#/rows
  - stepId: closeSession
    description: >-
      Close and delete the query session to release Vantage resources once the
      query has run.
    operationId: deleteSession
    parameters:
    - name: sessionId
      in: path
      value: $steps.openSession.outputs.sessionId
    successCriteria:
    - condition: $statusCode == 204
    outputs:
      closed: $statusCode
  outputs:
    sessionId: $steps.openSession.outputs.sessionId
    queryId: $steps.runQuery.outputs.queryId
    rowCount: $steps.runQuery.outputs.rowCount
    rows: $steps.runQuery.outputs.rows