Removed unneeded code in explain_query_prefix()
@@ -320,7 +320,7 @@ class DatabaseOperations(BaseDatabaseOperations):
for valid_option in self.explain_options:
value = options.pop(valid_option, None)
if value is not None:
- extra[valid_option.upper()] = value
+ extra[valid_option] = value
prefix = super().explain_query_prefix(format, **options)
if format:
extra["FORMAT"] = format
