fix hang

py-polars/tests/unit/conftest.py

@@ -212,6 +212,9 @@ def memory_usage_without_pyarrow() -> Generator[MemoryUsage, Any, Any]:
     if not pl.build_info()["compiler"]["debug"]:
         pytest.skip("Memory usage only available in debug/dev builds.")
 
+    if os.getenv("POLARS_FORCE_ASYNC", "0") == "1":
+        pytest.skip("Hangs when combined with async glob")
+
     if sys.platform == "win32":
         # abi3 wheels don't have the tracemalloc C APIs, which breaks linking
         # on Windows.

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

@@ -2057,10 +2057,6 @@ def test_read_csv_only_loads_selected_columns(
     monkeypatch: pytest.MonkeyPatch,
 ) -> None:
     """Only requested columns are loaded by ``read_csv()``."""
-    # This test hangs on when using FORCE_ASYNC, don't know why. Has something to
-    # do with the `MemoryUsage` object - it doesn't hang if we don't pass that to
-    # this function.
-    monkeypatch.setenv("POLARS_FORCE_ASYNC", "0")
     tmp_path.mkdir(exist_ok=True)
 
     # Each column will be about 8MB of RAM