chore(clickhouse): remove sqlalchemy dependency

ibis/backends/clickhouse/__init__.py

@@ -7,11 +7,11 @@
 from contextlib import closing
 from functools import partial
 from typing import TYPE_CHECKING, Any, Literal
+from urllib.parse import parse_qs, urlparse
 
 import clickhouse_connect as cc
 import pyarrow as pa
 import pyarrow_hotfix  # noqa: F401
-import sqlalchemy as sa
 import sqlglot as sg
 import sqlglot.expressions as sge
 import toolz
@@ -74,21 +74,28 @@ def _from_url(self, url: str, **kwargs) -> BaseBackend:
         BaseBackend
             A backend instance
         """
-        url = sa.engine.make_url(url)
-
-        kwargs = toolz.merge(
-            {
-                name: value
-                for name in ("host", "port", "database", "password")
-                if (value := getattr(url, name, None))
-            },
-            kwargs,
-        )
-        if username := url.username:
-            kwargs["user"] = username
-
-        kwargs.update(url.query)
+        url = urlparse(url)
+        database = url.path[1:]
+        query_params = parse_qs(url.query)
+
+        connect_args = {
+            "user": url.username,
+            "password": url.password or "",
+            "host": url.hostname,
+            "database": database or "",
+        }
+
+        for name, value in query_params.items():
+            if len(value) > 1:
+                connect_args[name] = value
+            elif len(value) == 1:
+                connect_args[name] = value[0]
+            else:
+                raise com.IbisError(f"Invalid URL parameter: {name}")
+
+        kwargs.update(connect_args)
         self._convert_kwargs(kwargs)
+
         return self.connect(**kwargs)
 
     def _convert_kwargs(self, kwargs):

pyproject.toml

@@ -187,7 +187,7 @@ bigquery = [
   "google-cloud-bigquery-storage",
   "pydata-google-auth",
 ]
-clickhouse = ["clickhouse-connect", "sqlalchemy"]
+clickhouse = ["clickhouse-connect"]
 dask = ["dask", "regex"]
 datafusion = ["datafusion"]
 druid = ["pydruid", "sqlalchemy"]