test: BigQuery E2E tests — 25 tests against live account

25 E2E tests against a live BigQuery project (diesel-command-384802):
- Service Account auth (connect, verify project, reject invalid creds)
- Query execution (SELECT, math, strings, timestamps, multi-column)
- LIMIT handling (explicit + parameter truncation)
- Schema introspection (listSchemas=datasets, listTables, describeTable)
- BigQuery-specific (UNNEST, STRUCT, DATE/DATETIME/TIMESTAMP, STRING_AGG,
  GENERATE_ARRAY)
- Adversarial inputs (multi-statement, empty, invalid SQL, non-existent
  dataset, Unicode, NULL, long column list)

Updated docs/docs/drivers.md: BigQuery now marked as E2E tested.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: anandgupta42

bun.lock

@@ -15,7 +15,7 @@ Altimate Code connects to 10 databases natively via TypeScript drivers. No Pytho
 | SQL Server | `mssql` | Password, Azure AD | ✅ Docker | Uses `tedious` TDS protocol |
 | Redshift | `pg` (wire-compat) | Password | ✅ Docker (PG wire) | Uses SVV system views |
 | Snowflake | `snowflake-sdk` | Password, Key-Pair (unencrypted + encrypted), OAuth | ✅ Live account | 37 E2E tests, key-pair with passphrase support |
-| BigQuery | `@google-cloud/bigquery` | Service Account, ADC | ❌ Needs credentials | REST/gRPC API |
+| BigQuery | `@google-cloud/bigquery` | Service Account, ADC | ✅ Live account | 25 E2E tests, UNNEST/STRUCT/DATE types |
 | Databricks | `@databricks/sql` | PAT, OAuth | ✅ Live account | 24 E2E tests, Unity Catalog support |
 | Oracle | `oracledb` (thin) | Password | ❌ Needs Oracle 12.1+ | Thin mode only, no Instant Client |
 
@@ -181,10 +181,14 @@ These features work based on SDK documentation but haven't been verified with au
 - ❌ OAuth/external browser auth (requires interactive browser)
 - ❌ Multi-cluster warehouse auto-scaling
 
-### BigQuery
-- Application Default Credentials (ADC)
-- Location-specific query execution
-- Dry run / cost estimation
+### BigQuery (partially tested — 25 E2E tests pass)
+- ✅ Service Account JSON key authentication
+- ✅ Schema introspection (datasets, tables, columns)
+- ✅ BigQuery types (UNNEST, STRUCT, DATE/DATETIME/TIMESTAMP, STRING_AGG)
+- ✅ Adversarial inputs (injection blocked, invalid SQL)
+- ❌ Application Default Credentials (ADC)
+- ❌ Location-specific query execution
+- ❌ Dry run / cost estimation
 
 ### Databricks (partially tested — 24 E2E tests pass)
 - ✅ Personal Access Token (PAT) authentication

docs/docs/drivers.md

@@ -85,6 +85,7 @@
   },
   "dependencies": {
     "@databricks/sql": "1.13.0",
+    "@google-cloud/bigquery": "8.1.1",
     "@opencode-ai/plugin": "workspace:*",
     "@opencode-ai/script": "workspace:*",
     "@opencode-ai/sdk": "workspace:*",

package.json

@@ -7,7 +7,6 @@ import type { ConnectionConfig, Connector, ConnectorResult, SchemaColumn } from
 export async function connect(config: ConnectionConfig): Promise<Connector> {
   let BigQueryModule: any
   try {
-    // @ts-expect-error — optional dependency, loaded at runtime
     BigQueryModule = await import("@google-cloud/bigquery")
   } catch {
     throw new Error(