fix(feature-flags): preserve case-insensitive boolean values

Signed-off-by: Cathleen Yan <58714163+cathleeny@users.noreply.github.com>

Author: cathleeny

src/databricks/sql/common/feature_flag.py

@@ -119,7 +119,7 @@ def _get_value(self, name: str) -> Any:
         try:
             return json.loads(raw) if raw is not None else None
         except (TypeError, ValueError):
-            return None
+            return {"true": True, "false": False}.get(str(raw).lower())
 
     def get_bool(self, name: str, default_value: bool = False) -> bool:
         value = self._get_value(name)

tests/unit/test_telemetry.py

@@ -1126,6 +1126,13 @@ def test_remove_instance_and_executor_cleanup(self):
         "getter,raw,expected",
         [
             ("bool", "true", True),
+            ("bool", "True", True),
+            ("bool", "TRUE", True),
+            ("bool", "tRuE", True),
+            ("bool", "false", False),
+            ("bool", "False", False),
+            ("bool", "FALSE", False),
+            ("bool", "fAlSe", False),
             ("bool", '"true"', False),
             ("int32", "2147483647", 2147483647),
             ("int32", "2147483648", None),