snapshot of https://github.com/zulip/zulip.git @ 48c69911c7dd4e03b20552eb3bd77ad8151c1357 (2026-09-15)

zerver/migrations/0808_message_topic_indexes_nulls_first.py

@@ -0,0 +1,83 @@
+import django.db.models.functions.text
+from django.contrib.postgres.operations import AddIndexConcurrently
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    atomic = False
+
+    dependencies = [
+        ("zerver", "0807_usertopic_zerver_usertopic_user_visibility_recipient_idx"),
+    ]
+
+    operations = [
+        migrations.RenameIndex(
+            model_name="message",
+            new_name="zerver_message_realm_upper_subject_nulls_last",
+            old_name="zerver_message_realm_upper_subject",
+        ),
+        migrations.RenameIndex(
+            model_name="message",
+            new_name="zerver_message_realm_recipient_upper_subject_nulls_last",
+            old_name="zerver_message_realm_recipient_upper_subject",
+        ),
+        migrations.RenameIndex(
+            model_name="message",
+            new_name="zerver_message_realm_recipient_subject_nulls_last",
+            old_name="zerver_message_realm_recipient_subject",
+        ),
+        migrations.RenameIndex(
+            model_name="message",
+            new_name="zerver_message_realm_id_nulls_last",
+            old_name="zerver_message_realm_id",
+        ),
+        AddIndexConcurrently(
+            model_name="message",
+            index=models.Index(
+                models.F("realm_id"),
+                django.db.models.functions.text.Upper("subject"),
+                models.OrderBy(models.F("id"), descending=True),
+                condition=models.Q(("is_channel_message", True)),
+                name="zerver_message_realm_upper_subject",
+            ),
+        ),
+        AddIndexConcurrently(
+            model_name="message",
+            index=models.Index(
+                models.F("realm_id"),
+                models.F("recipient_id"),
+                django.db.models.functions.text.Upper("subject"),
+                models.OrderBy(models.F("id"), descending=True),
+                condition=models.Q(("is_channel_message", True)),
+                name="zerver_message_realm_recipient_upper_subject",
+            ),
+        ),
+        AddIndexConcurrently(
+            model_name="message",
+            index=models.Index(
+                models.F("realm_id"),
+                models.F("recipient_id"),
+                models.F("subject"),
+                models.OrderBy(models.F("id"), descending=True),
+                condition=models.Q(("is_channel_message", True)),
+                name="zerver_message_realm_recipient_subject",
+            ),
+        ),
+        AddIndexConcurrently(
+            model_name="message",
+            index=models.Index(
+                models.F("realm_id"),
+                models.OrderBy(models.F("id"), descending=True),
+                name="zerver_message_realm_id",
+            ),
+        ),
+        # The two indexes above on Upper("subject") are expression
+        # indexes, whose per-expression statistics are only collected
+        # by ANALYZE; without them the planner cannot estimate the
+        # selectivity of a topic lookup.
+        migrations.RunSQL(
+            sql="ANALYZE zerver_message",
+            reverse_sql=migrations.RunSQL.noop,
+            elidable=True,
+        ),
+    ]