Please answer these questions before submitting your issue. Thanks!

1. What version of Python are you using?

   3.13.13

2. What operating system and processor architecture are you using?

   macOS-26.4.1-arm64-arm-64bit-Mach-O

3. What are the component versions in the environment (pip freeze)?

   asn1crypto==1.5.1
   boto3==1.43.2
   botocore==1.43.2
   certifi==2026.4.22
   cffi==2.0.0
   charset-normalizer==3.4.7
   cryptography==47.0.0
   filelock==3.29.0
   idna==3.13
   jmespath==1.1.0
   packaging==26.2
   platformdirs==4.9.6
   pycparser==3.0
   pyjwt==2.12.1
   pyopenssl==26.1.0
   python-dateutil==2.9.0.post0
   python-dotenv==1.2.2
   pytz==2026.1.post1
   requests==2.33.1
   s3transfer==0.17.0
   six==1.17.0
   snowflake-connector-python==4.4.0
   snowflake-sqlalchemy==1.9.0
   sortedcontainers==2.4.0
   sqlalchemy==2.0.49
   tomlkit==0.14.0
   typing-extensions==4.15.0
   urllib3==2.6.3

4. What did you do?

   import os
   
   from dotenv import load_dotenv
   from sqlalchemy import create_engine, select, text, Table, MetaData
   from snowflake.sqlalchemy import URL
   
   
   def main():
       load_dotenv(override=True)
   
       url = URL(
           account=os.environ["SNOWFLAKE_ACCOUNT"],
           database=os.environ["SNOWFLAKE_DATABASE"],
           schema="PUBLIC",
           user=os.environ["SNOWFLAKE_USERNAME"],
           password=os.environ["SNOWFLAKE_PASSWORD"],
       )
       engine = create_engine(url)
   
       with engine.begin() as conn:
           conn.execute(text("CREATE OR REPLACE TABLE sample_uuid_table(uuid_col UUID)"))
           conn.execute(text("INSERT INTO sample_uuid_table VALUES ('c73d9175-0a1d-48c6-8d30-df165461328b')"))
   
       meta = MetaData()
       sample = Table("sample_uuid_table", meta, autoload_with=engine)
       col = sample.columns["uuid_col"]
       print(f"{col.type=}")
   
       with engine.begin() as conn:
           data = conn.execute(select(sample))
   
       record = data.fetchone()
       print(record)
   
   
   if __name__ == "__main__":
       main()

   which outputs

   $ uv run python main.py
   /repro/snowflake-uuid/.venv/lib/python3.14/site-packages/snowflake/sqlalchemy/snowdialect.py:567: SAWarning: Did not recognize type 'UUID' of column 'uuid_col'
     sa_util.warn(
   col.type=NullType()
   ('c73d9175-0a1d-48c6-8d30-df165461328b',)

5. What did you expect to see?

   No warning, not a NullType, and a native python uuid.UUID instance in the record.

6. Can you set logging to DEBUG and collect the logs?

   import logging
   import os
   
   for logger_name in ['snowflake.sqlalchemy', 'snowflake.connector']:
      logger = logging.getLogger(logger_name)
      logger.setLevel(logging.DEBUG)
      ch = logging.StreamHandler()
      ch.setLevel(logging.DEBUG)
      ch.setFormatter(logging.Formatter('%(asctime)s - %(threadName)s %(filename)s:%(lineno)d - %(funcName)s() - %(levelname)s - %(message)s'))
      logger.addHandler(ch)
   

   That results in almost 1000 log lines...