[1.39.0 RELEASE ONLY]: Disable hybrid execution by default

CHANGELOG.md

@@ -49,7 +49,6 @@
 
 #### Improvements
 
-- Hybrid execution mode is now enabled by default. Certain operations on smaller data will now automatically execute in native pandas in-memory. Use `from modin.config import AutoSwitchBackend; AutoSwitchBackend.disable()` to turn this off and force all execution to occur in Snowflake.
 - Downgraded to level `logging.DEBUG - 1` the log message saying that the
   Snowpark `DataFrame` reference of an internal `DataFrameReference` object
   has changed.

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

@@ -5,7 +5,6 @@
 import inspect
 import sys
 from typing import Union, Callable, Any
-import warnings
 
 from packaging import version
 
@@ -174,19 +173,9 @@
 )
 from modin.config import AutoSwitchBackend  # isort: skip  # noqa: E402
 
-HYBRID_WARNING = (
-    "Snowpark pandas now runs with hybrid execution enabled by default, and will perform certain operations "
-    + "on smaller data using local, in-memory pandas. To disable this behavior and force all computations to occur in "
-    + "Snowflake, run this line:\nfrom modin.config import AutoSwitchBackend; AutoSwitchBackend.disable()"
-)
-
-warnings.filterwarnings("once", message=HYBRID_WARNING)
 
 if AutoSwitchBackend.get_value_source() is ValueSource.DEFAULT:
-    AutoSwitchBackend.enable()
-
-if AutoSwitchBackend.get():
-    warnings.warn(HYBRID_WARNING, stacklevel=1)
+    AutoSwitchBackend.disable()
 
 # Hybrid Mode Registration
 # In hybrid execution mode, the client will automatically switch backends when a

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

@@ -4,10 +4,10 @@
 
 
 def test_importing_plugin_always_turns_on_auto_switch_backend():
-    """Test that importing snowflake.snowpark.modin.plugin always turns AutoSwitchBackend."""
+    """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 True
+    assert AutoSwitchBackend.get() is False