[coverage] Conformance findings: TELEMETRY-001,TELEMETRY-002,TELEMETRY-005

issue 内の TelemetryEvent と emitStatementComplete への参照から始め、次に driver のコードと coverage PR に記載された xfail テストを調べます。thrift と sea の両方で TELEMETRY-001、TELEMETRY-002、TELEMETRY-005 のケースを再現します。完了の条件は、終端イベントが配信形式と圧縮を報告し、エラーテレメトリが SQL 由来のテキストを含まないサニタイズ済みカテゴリを使用することです。

Summary

Surfaced by the multi-language coverage fan-out while conformance-testing these SPEC-IDs against databricks/databricks-sql-nodejs. 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-nodejs) is fixed, then flips green as a tripwire.

Findings

• TELEMETRY-001 [thrift, sea]: the terminal statement.complete telemetry event never populates resultFormat or compressed, so the inline-Arrow delivery shape and uncompressed payload are never reported
  • failing test: TELEMETRY-001 — successful sync execute emits exactly one terminal event with operation metadata [thrift], TELEMETRY-001 — successful sync execute emits exactly one terminal event with operation metadata [sea] (see the coverage PR diff under tests/)
• TELEMETRY-002 [thrift, sea]: statement error telemetry copies the raw server error message and JS stack verbatim, leaking SQL-derived identifiers (sensitive_table) out of the customer process instead of a sanitized error category
  • failing test: TELEMETRY-002 — failed statement emits sanitized error telemetry without SQL text [thrift], TELEMETRY-002 — failed statement emits sanitized error telemetry without SQL text [sea] (see the coverage PR diff under tests/)
• TELEMETRY-005 [thrift, sea]: for a CloudFetch/external-links result the terminal event still reports no resultFormat/compressed, so EXTERNAL_LINKS delivery and server-declared compression are indistinguishable from an inline result
  • failing test: TELEMETRY-005 — telemetry reports external-links delivery and compression [thrift], TELEMETRY-005 — telemetry reports external-links delivery and compression [sea] (see the coverage PR diff under tests/)
• TELEMETRY-002: statement error telemetry copies the raw server error message and JS stack verbatim into errorMessage/errorStack, leaking SQL-derived identifiers (table/column names, and any literals the server quotes) out of the customer process; the error descriptor should be sanitized to an aggregatable category/name
• TELEMETRY-001: the terminal statement.complete telemetry event never populates resultFormat or compressed (both are declared on TelemetryEvent and accepted by emitStatementComplete), so the result-delivery shape of an inline result (INLINE_ARROW, uncompressed) is never reported and downstream delivery-shape aggregates are blind
• TELEMETRY-005: for a CloudFetch/external-links result the terminal statement.complete event still reports no resultFormat/compressed, so EXTERNAL_LINKS delivery and the server-declared LZ4_FRAME compression are never distinguishable from an inline result in telemetry

Context

• The behavior was first fixed in a DIFFERENT driver — reference PR: https://github.com/databricks/databricks-sql-kernel/pull/272 — which seeded the shared language-neutral spec. This issue tracks the same conformance gap in databricks/databricks-sql-nodejs; 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/1389