Fixed #25180 -- Prevented varchar_patterns_ops and text_patterns_ops indexes for ArrayField.

tests/postgres_tests/array_index_migrations/0001_initial.py

@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+import django.contrib.postgres.fields
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='CharTextArrayIndexModel',
+            fields=[
+                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
+                ('char', django.contrib.postgres.fields.ArrayField(models.CharField(max_length=10), db_index=True, size=100)),
+                ('char2', models.CharField(max_length=11, db_index=True)),
+                ('text', django.contrib.postgres.fields.ArrayField(models.TextField(), db_index=True)),
+            ],
+            options={
+            },
+            bases=(models.Model,),
+        ),
+    ]