Refs #34534 -- Reduced Add/RemoveConstraint and Add/RenameIndex operations when optimizing migrations.

tests/migrations/test_optimizer.py

@@ -2,6 +2,7 @@ from django.db import migrations, models
 from django.db.migrations import operations
 from django.db.migrations.optimizer import MigrationOptimizer
 from django.db.migrations.serializer import serializer_factory
+from django.db.models.functions import Abs
 from django.test import SimpleTestCase
 
 from .models import EmptyManager, UnicodeModel
@@ -1159,6 +1160,38 @@ class OptimizerTests(SimpleTestCase):
             ]
         )
 
+    def test_add_rename_index(self):
+        tests = [
+            models.Index(fields=["weight", "pink"], name="mid_name"),
+            models.Index(Abs("weight"), name="mid_name"),
+            models.Index(
+                Abs("weight"), name="mid_name", condition=models.Q(weight__gt=0)
+            ),
+        ]
+        for index in tests:
+            with self.subTest(index=index):
+                renamed_index = index.clone()
+                renamed_index.name = "new_name"
+                self.assertOptimizesTo(
+                    [
+                        migrations.AddIndex("Pony", index),
+                        migrations.RenameIndex(
+                            "Pony", new_name="new_name", old_name="mid_name"
+                        ),
+                    ],
+                    [
+                        migrations.AddIndex("Pony", renamed_index),
+                    ],
+                )
+                self.assertDoesNotOptimize(
+                    [
+                        migrations.AddIndex("Pony", index),
+                        migrations.RenameIndex(
+                            "Pony", new_name="new_name", old_name="other_name"
+                        ),
+                    ],
+                )
+
     def test_add_remove_index(self):
         self.assertOptimizesTo(
             [
@@ -1173,6 +1206,24 @@ class OptimizerTests(SimpleTestCase):
             [],
         )
 
+    def test_add_remove_constraint(self):
+        gt_constraint = models.CheckConstraint(
+            check=models.Q(pink__gt=2), name="constraint_pony_pink_gt_2"
+        )
+        self.assertOptimizesTo(
+            [
+                migrations.AddConstraint("Pony", gt_constraint),
+                migrations.RemoveConstraint("Pony", gt_constraint.name),
+            ],
+            [],
+        )
+        self.assertDoesNotOptimize(
+            [
+                migrations.AddConstraint("Pony", gt_constraint),
+                migrations.RemoveConstraint("Pony", "other_name"),
+            ],
+        )
+
     def test_create_model_add_index(self):
         self.assertOptimizesTo(
             [