refactor(duckdb): replace register usage with read

ibis/backends/__init__.py

@@ -1425,10 +1425,15 @@ def connect(resource: Path | str, **kwargs: Any) -> BaseBackend:
             return ibis.duckdb.connect(path, **kwargs)
         elif path.endswith((".sqlite", ".db")):
             return ibis.sqlite.connect(path, **kwargs)
-        elif path.endswith((".parquet", ".csv", ".csv.gz")):
-            # Load parquet/csv/csv.gz files with duckdb by default
+        elif path.endswith((".csv", ".csv.gz")):
+            # Load csv/csv.gz files with duckdb by default
             con = ibis.duckdb.connect(**kwargs)
-            con.register(path)
+            con.read_csv(path)
+            return con
+        elif path.endswith(".parquet"):
+            # Load parquet files with duckdb by default
+            con = ibis.duckdb.connect(**kwargs)
+            con.read_parquet(path)
             return con
         else:
             raise ValueError(f"Don't know how to connect to {resource!r}")

ibis/backends/duckdb/tests/test_client.py

@@ -270,9 +270,7 @@ def test_connect_local_file(out_method, extension, tmp_path):
     df = pd.DataFrame({"a": [1, 2, 3]})
     path = tmp_path / f"out.{extension}"
     getattr(df, out_method)(path)
-    with pytest.warns(FutureWarning, match="v9.1"):
-        # ibis.connect uses con.register
-        con = ibis.connect(path)
+    con = ibis.connect(path)
     t = next(iter(con.tables.values()))
     assert not t.head().execute().empty