bug: trino backend connect incorrectly processes empty scheme

[baumgold]

What happened?

Connecting to a trino database with a user/pass using http_scheme="https" does not work. I believe this is because the do_connect function does not enter the following if statement due to the walrus operator returning the scheme as an empty string which implicitly evaluates to False.

https://github.com/ibis-project/ibis/blob/11.0.0/ibis/backends/trino/__init__.py#L301

What version of ibis are you using?

ibis-framework==11.0.0

What backend(s) are you using, if any?

trino

Relevant log output

>>> import ibis
>>> conn = ibis.trino.connect(user=<user>, auth=<pass>, host=host, database=database, http_scheme="https")
>>> table = conn.table(<table-name>, database=(<catalog>, <database>))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
    table = conn.table("mavenexe_optionsignalnotification", database=("raw", "mmbus"))
  File "~/.venv/lib/python3.13/site-packages/ibis/backends/sql/__init__.py", line 85, in table
    table_schema = self.get_schema(name, catalog=catalog, database=database)
  File "~/.venv/lib/python3.13/site-packages/ibis/backends/trino/__init__.py", line 174, in get_schema
    with self._safe_raw_sql(query) as cur:
         ~~~~~~~~~~~~~~~~~~^^^^^^^
  File "/home/linuxbrew/.linuxbrew/opt/python@3.13/lib/python3.13/contextlib.py", line 141, in __enter__
    return next(self.gen)
  File "~/.venv/lib/python3.13/site-packages/ibis/backends/trino/__init__.py", line 128, in _safe_raw_sql
    cur = self.raw_sql(query)
  File "~/.venv/lib/python3.13/site-packages/ibis/backends/trino/__init__.py", line 80, in raw_sql
    cur = con.cursor()
  File "~/.venv/lib/python3.13/site-packages/trino/dbapi.py", line 299, in cursor
    request = self._create_request()
  File "~/.venv/lib/python3.13/site-packages/trino/dbapi.py", line 280, in _create_request
    return trino.client.TrinoRequest(
           ~~~~~~~~~~~~~~~~~~~~~~~~~^
        self.host,
        ^^^^^^^^^^
    ...<6 lines>...
        self.request_timeout,
        ^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "~/.venv/lib/python3.13/site-packages/trino/client.py", line 498, in __init__
    self._auth.set_http_session(self._http_session)
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'str' object has no attribute 'set_http_session'

Code of Conduct

• I agree to follow this project's Code of Conduct

[NickCrews]

@baumgold can you please make your example more specific so we can see the format of the host, username, and password you are using? eg is host a mydb.com, http://mydb.com, https://mydb.com, or trino://mydb.com?

eg conn = ibis.trino.connect(user="a username str", auth="a password str", host="mydb.com", database="my_database", http_scheme="https")

And please describe what the expected behavior is for variations of this. eg how do you expect host="http://mydb.com", http_scheme="https" to behave?