[coverage] Conformance findings: ERRORRECOV-013

Commencez par lire le test en échec test_rate_limit_retry_count_zero_disables_retries dans le diff du PR de coverage sous tests/, puis suivez la configuration de nouvelle tentative Thrift utilisée pour OpenSession. C’est terminé lorsqu’un nombre explicite de nouvelles tentatives égal à 1 produit exactement un appel à OpenSession sous un 429 persistant, tandis que la politique par défaut effectue toujours des nouvelles tentatives et que l’erreur contient le libellé de rate limit spécifié.

Summary

Surfaced by the multi-language coverage fan-out while conformance-testing these SPEC-IDs against databricks/databricks-sql-python. Each finding is committed as an expected-failure (xfail) test in the coverage PR — the test asserts the CORRECT (post-fix) behavior and stays red until THIS driver (databricks/databricks-sql-python) is fixed, then flips green as a tripwire.

Findings

• ERRORRECOV-013 [thrift]: Thrift backend ignores an explicit disable-retries retry count: _retry_stop_after_attempts_count=1 still yields 2 OpenSession attempts under a persistent 429 (the count becomes urllib3's total, which raises MaxRetryError only after the extra attempt); the kernel/SEA backend honours the same kwarg correctly
  • failing test: test_rate_limit_retry_count_zero_disables_retries (see the coverage PR diff under tests/)

Reproduce & Expected

ERRORRECOV-013 — Validate the rate-limit retry COUNT knob (the reference driver's RateLimitRetry), as distinct from the retry TIME BUDGET that ERRORRECOV-010 covers.

Expected (per the shared spec):

• [thrift] exactly 1 OpenSession call(s)
• [sea] exactly 1 CreateSession call(s)
• full assertion contract:

result:
- label: retries_disabled
  error:
    contains:
    - '429'
    - too many requests
    - rate
- label: default_policy
  error:
    contains:
    - '429'
    - too many requests
    - rate
protocol:
  thrift:
  - label: retries_disabled
    call_count:
      method: OpenSession
      expected: 1
  - label: default_policy
    call_min:
      method: OpenSession
      min: 2
  sea:
  - label: retries_disabled
    call_count:
      operation: CreateSession
      expected: 1
  - label: default_policy
    call_min:
      operation: CreateSession
      min: 2

Context

• The behavior was first fixed in a DIFFERENT driver — reference PR: https://github.com/databricks/databricks-odbc/pull/180 — which seeded the shared language-neutral spec. This issue tracks the same conformance gap in databricks/databricks-sql-python; the reference PR is for cross-referencing the intended behavior, NOT a change to this repo.
• Coverage PR carrying the reproducing xfail test(s): https://github.com/databricks/databricks-driver-test/pull/1109