From 95238a7de867e2a23a9247e3d6d8f654f4cee908 Mon Sep 17 00:00:00 2001
From: Adam Chainz <me@adamj.eu>
Date: Mon, 28 Nov 2016 18:29:21 +0000
Subject: [PATCH] Fixed #27321 -- Added detection for table case name
 sensitivity on MySQL.

---
 django/db/backends/base/features.py    | 4 ++--
 django/db/backends/base/schema.py      | 2 +-
 django/db/backends/mysql/features.py   | 7 +++++++
 django/db/backends/oracle/features.py  | 2 +-
 django/db/backends/sqlite3/features.py | 2 +-
 docs/releases/1.11.txt                 | 3 +++
 6 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/django/db/backends/base/features.py b/django/db/backends/base/features.py
index 338e0612b7..7fa8561c95 100644
--- a/django/db/backends/base/features.py
+++ b/django/db/backends/base/features.py
@@ -224,9 +224,9 @@ class BaseDatabaseFeatures(object):
     # Defaults to False to allow third-party backends to opt-in.
     can_clone_databases = False
 
-    # Does the backend consider quoted identifiers with different casing to
+    # Does the backend consider table names with different casing to
     # be equal?
-    ignores_quoted_identifier_case = False
+    ignores_table_name_case = False
 
     # Place FOR UPDATE right after FROM clause. Used on MSSQL.
     for_update_after_from = False
diff --git a/django/db/backends/base/schema.py b/django/db/backends/base/schema.py
index f780b1cda0..4b543a921a 100644
--- a/django/db/backends/base/schema.py
+++ b/django/db/backends/base/schema.py
@@ -375,7 +375,7 @@ class BaseDatabaseSchemaEditor(object):
         Renames the table a model points to.
         """
         if (old_db_table == new_db_table or
-            (self.connection.features.ignores_quoted_identifier_case and
+            (self.connection.features.ignores_table_name_case and
                 old_db_table.lower() == new_db_table.lower())):
             return
         self.execute(self.sql_rename_table % {
diff --git a/django/db/backends/mysql/features.py b/django/db/backends/mysql/features.py
index 81494efa63..ca8143b875 100644
--- a/django/db/backends/mysql/features.py
+++ b/django/db/backends/mysql/features.py
@@ -72,3 +72,10 @@ class DatabaseFeatures(BaseDatabaseFeatures):
         All storage engines except MyISAM support transactions.
         """
         return self._mysql_storage_engine != 'MyISAM'
+
+    @cached_property
+    def ignores_table_name_case(self):
+        with self.connection.cursor() as cursor:
+            cursor.execute('SELECT @@LOWER_CASE_TABLE_NAMES')
+            result = cursor.fetchone()
+            return result and result[0] != 0
diff --git a/django/db/backends/oracle/features.py b/django/db/backends/oracle/features.py
index f09dee8425..c247517699 100644
--- a/django/db/backends/oracle/features.py
+++ b/django/db/backends/oracle/features.py
@@ -37,7 +37,7 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     supports_temporal_subtraction = True
     # Oracle doesn't ignore quoted identifiers case but the current backend
     # does by uppercasing all identifiers.
-    ignores_quoted_identifier_case = True
+    ignores_table_name_case = True
 
     def introspected_boolean_field_type(self, field=None, created_separately=False):
         """
diff --git a/django/db/backends/sqlite3/features.py b/django/db/backends/sqlite3/features.py
index 43bec87c99..4f8d3d5742 100644
--- a/django/db/backends/sqlite3/features.py
+++ b/django/db/backends/sqlite3/features.py
@@ -33,7 +33,7 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     supports_sequence_reset = False
     can_clone_databases = True
     supports_temporal_subtraction = True
-    ignores_quoted_identifier_case = True
+    ignores_table_name_case = True
 
     @cached_property
     def uses_savepoints(self):
diff --git a/docs/releases/1.11.txt b/docs/releases/1.11.txt
index 486362fe43..0c60b8488b 100644
--- a/docs/releases/1.11.txt
+++ b/docs/releases/1.11.txt
@@ -456,6 +456,9 @@ Database backend API
   which is deprecated. Custom database backends should ensure all types of
   indexes are returned by ``DatabaseIntrospection.get_constraints()``.
 
+* Renamed the ``ignores_quoted_identifier_case`` feature to
+  ``ignores_table_name_case`` to more accurately reflect how it is used.
+
 Dropped support for PostgreSQL 9.2 and PostGIS 2.0
 --------------------------------------------------