[3.0.x] Fixed #30986 -- Fixed queryset crash when filtering against boolean RawSQL expressions on Oracle.

Backport of 8685e764ef from master

django/db/backends/oracle/operations.py

@@ -6,7 +6,7 @@ from functools import lru_cache
 from django.conf import settings
 from django.db.backends.base.operations import BaseDatabaseOperations
 from django.db.backends.utils import strip_quotes, truncate_name
-from django.db.models.expressions import Exists, ExpressionWrapper
+from django.db.models.expressions import Exists, ExpressionWrapper, RawSQL
 from django.db.models.query_utils import Q
 from django.db.utils import DatabaseError
 from django.utils import timezone
@@ -625,4 +625,6 @@ END;
             return True
         if isinstance(expression, ExpressionWrapper) and isinstance(expression.expression, Q):
             return True
+        if isinstance(expression, RawSQL) and expression.conditional:
+            return True
         return False

tests/expressions/tests.py

@@ -91,6 +91,14 @@ class BasicExpressionsTests(TestCase):
             2,
         )
 
+    def test_filtering_on_rawsql_that_is_boolean(self):
+        self.assertEqual(
+            Company.objects.filter(
+                RawSQL('num_employees > %s', (3,), output_field=models.BooleanField()),
+            ).count(),
+            2,
+        )
+
     def test_filter_inter_attribute(self):
         # We can filter on attribute relationships on same model obj, e.g.
         # find companies where the number of employees is greater