From aadd3aeb2ba3153e35bd805c80c901f289a6f333 Mon Sep 17 00:00:00 2001
From: Sergey Fedoseev <fedoseev.sergey@gmail.com>
Date: Mon, 31 Jul 2017 20:02:23 +0500
Subject: Avoided creating temporary lists for obtaining the first item.

---
 django/db/models/sql/query.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'django/db/models/sql')

diff --git a/django/db/models/sql/query.py b/django/db/models/sql/query.py
index b691fc424b..48bbd7c851 100644
--- a/django/db/models/sql/query.py
+++ b/django/db/models/sql/query.py
@@ -217,7 +217,8 @@ class Query:
 
     @cached_property
     def base_table(self):
-        return list(self.alias_map)[0] if self.alias_map else None
+        for alias in self.alias_map:
+            return alias
 
     def __str__(self):
         """
-- 
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