SNOW-2249808: Turn off AutoSwitchBackend if set to True by default. (#3631)

Signed-off-by: sfc-gh-mvashishtha <mahesh.vashishtha@snowflake.com>

Author: sfc-gh-mvashishtha

src/snowflake/snowpark/modin/plugin/__init__.py

@@ -170,10 +170,7 @@
 )
 from modin.config import AutoSwitchBackend  # isort: skip  # noqa: E402
 
-if (
-    AutoSwitchBackend.get() is not AutoSwitchBackend.default
-    and AutoSwitchBackend.get_value_source() is not ValueSource.DEFAULT
-):
+if AutoSwitchBackend.get_value_source() is ValueSource.DEFAULT:
     AutoSwitchBackend.disable()
 
 # Hybrid Mode Registration

tests/integ/modin/hybrid/auto_switch_backend/test_default_not_changed.py

@@ -0,0 +1,13 @@
+#
+# Copyright (c) 2012-2025 Snowflake Computing Inc. All rights reserved.
+#
+
+
+def test_importing_plugin_always_turns_off_auto_switch_backend():
+    """Test that importing snowflake.snowpark.modin.plugin always turns AutoSwitchBackend off."""
+
+    from modin.config import AutoSwitchBackend
+
+    import snowflake.snowpark.modin.plugin  # noqa: F401
+
+    assert AutoSwitchBackend.get() is False

tests/integ/modin/hybrid/auto_switch_backend/test_plugin_default.py

@@ -0,0 +1,16 @@
+#
+# Copyright (c) 2012-2025 Snowflake Computing Inc. All rights reserved.
+#
+
+
+def test_auto_switch_backend_user_sets_to_False():
+    """Test that importing snowflake.snowpark.modin.plugin does not override user's AutoSwitchBackend setting"""
+
+    from modin.config import AutoSwitchBackend
+
+    AutoSwitchBackend.disable()
+    assert AutoSwitchBackend.get() is False
+
+    import snowflake.snowpark.modin.plugin  # noqa: F401
+
+    assert AutoSwitchBackend.get() is False