From 658f1e81a7ea29acf30bbf8f61ffec2beff24639 Mon Sep 17 00:00:00 2001
From: Simon Charette <charette.s@gmail.com>
Date: Wed, 21 Sep 2016 21:53:48 -0400
Subject: [PATCH] Removed unnecessary casting when using builtin lookups on
 PostgreSQL.

---
 django/db/backends/postgresql/operations.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/django/db/backends/postgresql/operations.py b/django/db/backends/postgresql/operations.py
index c32ca040e79..a30d24a0ebd 100644
--- a/django/db/backends/postgresql/operations.py
+++ b/django/db/backends/postgresql/operations.py
@@ -83,6 +83,8 @@ class DatabaseOperations(BaseDatabaseOperations):
                            'istartswith', 'endswith', 'iendswith', 'regex', 'iregex'):
             if internal_type in ('IPAddressField', 'GenericIPAddressField'):
                 lookup = "HOST(%s)"
+            elif internal_type in ('CharField', 'TextField'):
+                lookup = '%s'
             else:
                 lookup = "%s::text"