chore(ibis): enhance the function list of BigQuery and MSSQL

[goldmedal]

BigQuery

• Backward compitable with group_concat: https://cloud.google.com/bigquery/docs/reference/legacy-sql#group_concat
• Add date function: https://cloud.google.com/bigquery/docs/reference/standard-sql/date_functions#date

MSSQL

• isnull
• year
• format
• group_concat

Summary by CodeRabbit

• New Features

  • Local query runner: improved MSSQL support — uses T-SQL dialect and adds connection validation for MSSQL sources.

• Tests

  • BigQuery connector tests updated to expect 179 remote functions.
  • MSSQL connector tests updated to reflect 10 additional remote functions in listings.

[coderabbitai]

Walkthrough

Updated test expectations for BigQuery and MSSQL function-list counts, and added MSSQL-specific handling and imports to the local query runner (validation and connection retrieval, plus transpile dialect set to "tsql"). No public API signatures were changed.

Changes

Cohort / File(s)	Summary
BigQuery tests ibis-server/tests/routers/v3/connector/bigquery/test_functions.py	Adjust expected count in test_function_list from 178 to 179; other assertions unchanged.
MSSQL tests ibis-server/tests/routers/v3/connector/mssql/test_functions.py	Updated expected function list length: DATAFUSION_FUNCTION_COUNT + 6 → DATAFUSION_FUNCTION_COUNT + 10; still asserts presence/details of sysdatetime.
Local query runner ibis-server/tools/query_local_run.py	Added MSSqlConnectionInfo import; special-case data_source == "mssql" to validate with MSSqlConnectionInfo.model_validate_json, obtain connection via DataSourceExtension.get_mssql_connection, and set transpile dialect to tsql.

Sequence Diagram(s)

sequenceDiagram
  autonumber
  actor User
  participant CLI as query_local_run CLI
  participant Runner as query_local_run
  participant Validator as MSSqlConnectionInfo
  participant Ext as DataSourceExtension
  participant Transpiler as Ibis transpile

  User->>CLI: run query with data_source="mssql"
  CLI->>Runner: dispatch request (data_source="mssql")
  Runner->>Validator: MSSqlConnectionInfo.model_validate_json(connection_info)
  alt validation OK
    Runner->>Ext: get_mssql_connection(connection_info)
    Ext-->>Runner: mssql connection
    Runner->>Transpiler: transpile(expr, dialect="tsql")
    Transpiler-->>Runner: SQL (tsql)
    Runner-->>User: execute and return results
  else validation fails
    Validator-->>Runner: raise validation error
    Runner-->>User: surface error
  end

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Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• chore(ibis-bq): add timestamp function for BigQuery #1165 — Similar update touching BigQuery function-list tests and query_local_run.py.
• chore: fix BigQuery v3 test cases #1031 — Adjusts the same BigQuery test assertion (expected function count).
• feat(core): bump DataFusion to 49.0.1 #1293 — Related bump/adjustments to DataFusion function counts referenced by tests.

Suggested reviewers

• douenergy
• wwwy3y3

Poem

I nibble code, I hop and pry,
Counts increased beneath the sky.
MSSQL learns to speak in tsql tune,
BigQuery gained a little moon.
Hooray — a patch, a carrot, done! 🐰✨

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title Check	✅ Passed	The title clearly and concisely describes the key change—updating the function lists for BigQuery and MSSQL—without unnecessary detail or ambiguity, making it easy to understand the primary purpose of the pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

✨ Finishing touches

• 📝 Generate Docstrings

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment

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[goldmedal]

BigQuery has been tested locally