don't translate dict parameter input to pyarrow.Table (for adbc)

py-polars/polars/io/database.py

@@ -8,12 +8,13 @@
 
 from polars._utils.deprecation import issue_deprecation_warning
 from polars.convert import from_arrow
-from polars.dependencies import pyarrow as pa
 from polars.exceptions import InvalidOperationError, UnsuitableSQLError
 
 if TYPE_CHECKING:
     from types import TracebackType
 
+    import pyarrow as pa
+
     if sys.version_info >= (3, 10):
         from typing import TypeAlias
     else:
@@ -822,14 +823,6 @@ def _read_sql_adbc(
     execute_options: dict[str, Any] | None = None,
 ) -> DataFrame:
     with _open_adbc_connection(connection_uri) as conn, conn.cursor() as cursor:
-        if (
-            execute_options
-            and (params := execute_options.get("parameters")) is not None
-        ):
-            if isinstance(params, dict):
-                params = pa.Table.from_pydict({k: [v] for k, v in params.items()})
-                execute_options["parameters"] = params
-
         cursor.execute(query, **(execute_options or {}))
         tbl = cursor.fetch_arrow_table()
     return from_arrow(tbl, schema_overrides=schema_overrides)  # type: ignore[return-value]

py-polars/tests/unit/io/test_database_read.py

@@ -9,6 +9,7 @@
 from types import GeneratorType
 from typing import TYPE_CHECKING, Any, NamedTuple
 
+import pyarrow as pa
 import pytest
 from sqlalchemy import Integer, MetaData, Table, create_engine, func, select
 from sqlalchemy.orm import sessionmaker
@@ -20,8 +21,6 @@
 from polars.testing import assert_frame_equal
 
 if TYPE_CHECKING:
-    import pyarrow as pa
-
     from polars.type_aliases import (
         ConnectionOrCursor,
         DbReadEngine,
@@ -431,7 +430,7 @@ def test_read_database_parameterised_uri(
     expected_frame = pl.DataFrame({"year": [2021], "name": ["other"], "value": [-99.5]})
 
     for param, param_value in (
-        (":n", {"n": 0}),
+        (":n", pa.Table.from_pydict({"n": [0]})),
         ("?", (0,)),
         ("?", [0]),
     ):