Fixed #34701 -- Added support for NULLS [NOT] DISTINCT on PostgreSQL 15+.

tests/validation/models.py

@@ -217,3 +217,17 @@ class UniqueConstraintConditionProduct(models.Model):
                 condition=models.Q(color__isnull=True),
             ),
         ]
+
+
+class UniqueConstraintNullsDistinctProduct(models.Model):
+    name = models.CharField(max_length=255, blank=True, null=True)
+
+    class Meta:
+        required_db_features = {"supports_nulls_distinct_unique_constraints"}
+        constraints = [
+            models.UniqueConstraint(
+                fields=["name"],
+                name="name_nulls_not_distinct_uniq",
+                nulls_distinct=False,
+            ),
+        ]