fix lint

Author: sycai

bigframes/core/compile/sqlglot/expressions/ai_ops.py

@@ -15,7 +15,6 @@
 from __future__ import annotations
 
 from dataclasses import asdict
-import typing
 
 import sqlglot.expressions as sge
 

tests/system/small/bigquery/test_ai.py

@@ -115,7 +115,7 @@ def test_ai_generate_with_invalid_output_schema_raise_error(session):
     prompt = ("Describe ", country)
 
     with pytest.raises(ValueError):
-        result = bbq.ai.generate(
+        bbq.ai.generate(
             prompt,
             endpoint="gemini-2.5-flash",
             output_schema={"population": "INT64", "is_in_north_america": "bool"},