[2.2.x] Fixed #30335, #29139 -- Fixed crash when ordering or aggregating over a nested JSONField key transform.

Backport of d87bd29c4f from master.

tests/postgres_tests/test_json.py

@@ -1,10 +1,11 @@
 import datetime
+import operator
 import uuid
 from decimal import Decimal
 
 from django.core import checks, exceptions, serializers
 from django.core.serializers.json import DjangoJSONEncoder
-from django.db.models import Q
+from django.db.models import Count, Q
 from django.forms import CharField, Form, widgets
 from django.test.utils import isolate_apps
 from django.utils.html import escape
@@ -15,6 +16,7 @@ from .models import JSONModel, PostgreSQLModel
 try:
     from django.contrib.postgres import forms
     from django.contrib.postgres.fields import JSONField
+    from django.contrib.postgres.fields.jsonb import KeyTextTransform, KeyTransform
 except ImportError:
     pass
 
@@ -153,6 +155,27 @@ class TestQuerying(PostgreSQLTestCase):
         query = JSONModel.objects.filter(field__name__isnull=False).order_by('field__ord')
         self.assertSequenceEqual(query, [objs[4], objs[2], objs[3], objs[1], objs[0]])
 
+    def test_ordering_grouping_by_key_transform(self):
+        base_qs = JSONModel.objects.filter(field__d__0__isnull=False)
+        for qs in (
+            base_qs.order_by('field__d__0'),
+            base_qs.annotate(key=KeyTransform('0', KeyTransform('d', 'field'))).order_by('key'),
+        ):
+            self.assertSequenceEqual(qs, [self.objs[8]])
+        qs = JSONModel.objects.filter(field__isnull=False)
+        self.assertQuerysetEqual(
+            qs.values('field__d__0').annotate(count=Count('field__d__0')).order_by('count'),
+            [1, 10],
+            operator.itemgetter('count'),
+        )
+        self.assertQuerysetEqual(
+            qs.filter(field__isnull=False).annotate(
+                key=KeyTextTransform('f', KeyTransform('1', KeyTransform('d', 'field'))),
+            ).values('key').annotate(count=Count('key')).order_by('count'),
+            [(None, 0), ('g', 1)],
+            operator.itemgetter('key', 'count'),
+        )
+
     def test_deep_values(self):
         query = JSONModel.objects.values_list('field__k__l')
         self.assertSequenceEqual(