Fixed #28584 -- Dropped support for SQLite < 3.7.15.

django/db/backends/sqlite3/features.py

@@ -2,8 +2,6 @@ from django.db import utils
 from django.db.backends.base.features import BaseDatabaseFeatures
 from django.utils.functional import cached_property
 
-from .base import Database
-
 
 class DatabaseFeatures(BaseDatabaseFeatures):
     # SQLite cannot handle us only partially reading from a cursor's result set
@@ -30,13 +28,9 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     supports_temporal_subtraction = True
     ignores_table_name_case = True
     supports_cast_with_precision = False
-    uses_savepoints = Database.sqlite_version_info >= (3, 6, 8)
+    uses_savepoints = True
-    supports_index_column_ordering = Database.sqlite_version_info >= (3, 3, 0)
+    can_release_savepoints = True
-    can_release_savepoints = uses_savepoints
+    can_share_in_memory_db = True
-    can_share_in_memory_db = (
-        Database.__name__ == 'sqlite3.dbapi2' and
-        Database.sqlite_version_info >= (3, 7, 13)
-    )
 
     @cached_property
     def supports_stddev(self):

django/db/backends/sqlite3/introspection.py

@@ -87,21 +87,6 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
         pk_col = self.get_primary_key_column(cursor, table_name)
         return [{'table': table_name, 'column': pk_col}]
 
-    def column_name_converter(self, name):
-        """
-        SQLite will in some cases, e.g. when returning columns from views and
-        subselects, return column names in 'alias."column"' format instead of
-        simply 'column'.
-
-        Affects SQLite < 3.7.15, fixed by http://www.sqlite.org/src/info/5526e0aa3c
-        """
-        # TODO: remove when SQLite < 3.7.15 is sufficiently old.
-        # 3.7.13 ships in Debian stable as of 2014-03-21.
-        if self.connection.Database.sqlite_version_info < (3, 7, 15):
-            return name.split('.')[-1].strip('"')
-        else:
-            return name
-
     def get_relations(self, cursor, table_name):
         """
         Return a dictionary of {field_name: (field_name_other_table, other_table)}

docs/ref/contrib/gis/install/index.txt

@@ -61,7 +61,7 @@ Database            Library Requirements            Supported Versions  Notes
 PostgreSQL          GEOS, GDAL, PROJ.4, PostGIS     9.4+                Requires PostGIS.
 MySQL               GEOS, GDAL                      5.6+                Not OGC-compliant; :ref:`limited functionality <mysql-spatial-limitations>`.
 Oracle              GEOS, GDAL                      12.1+               XE not supported.
-SQLite              GEOS, GDAL, PROJ.4, SpatiaLite  3.6.+               Requires SpatiaLite 4.1+
+SQLite              GEOS, GDAL, PROJ.4, SpatiaLite  3.7.15+                Requires SpatiaLite 4.1+
 ==================  ==============================  ==================  =========================================
 
 See also `this comparison matrix`__ on the OSGeo Wiki for

docs/ref/models/indexes.txt

@@ -40,12 +40,6 @@ For example ``Index(fields=['headline', '-pub_date'])`` would create SQL with
 ``(headline, pub_date DESC)``. Index ordering isn't supported on MySQL. In that
 case, a descending index is created as a normal index.
 
-.. admonition:: Support for column ordering on SQLite
-
-    Column ordering is supported on SQLite 3.3.0+ and only for some database
-    file formats. Refer to the `SQLite docs
-    <https://www.sqlite.org/lang_createindex.html>`_ for specifics.
-
 ``name``
 --------
 

docs/topics/db/transactions.txt

@@ -487,9 +487,9 @@ Savepoints
 
 A savepoint is a marker within a transaction that enables you to roll back
 part of a transaction, rather than the full transaction. Savepoints are
-available with the SQLite (≥ 3.6.8), PostgreSQL, Oracle and MySQL (when using
+available with the SQLite, PostgreSQL, Oracle, and MySQL (when using the InnoDB
-the InnoDB storage engine) backends. Other backends provide the savepoint
+storage engine) backends. Other backends provide the savepoint functions, but
-functions, but they're empty operations -- they don't actually do anything.
+they're empty operations -- they don't actually do anything.
 
 Savepoints aren't especially useful if you are using autocommit, the default
 behavior of Django. However, once you open a transaction with :func:`atomic`,
@@ -582,8 +582,8 @@ Database-specific notes
 Savepoints in SQLite
 --------------------
 
-While SQLite ≥ 3.6.8 supports savepoints, a flaw in the design of the
+While SQLite supports savepoints, a flaw in the design of the :mod:`sqlite3`
-:mod:`sqlite3` module makes them hardly usable.
+module makes them hardly usable.
 
 When autocommit is enabled, savepoints don't make sense. When it's disabled,
 :mod:`sqlite3` commits implicitly before savepoint statements. (In fact, it

docs/topics/testing/overview.txt

@@ -177,7 +177,7 @@ control the particular collation used by the test database. See the
 :doc:`settings documentation </ref/settings>` for details of these
 and other advanced settings.
 
-If using an SQLite in-memory database with SQLite 3.7.13+, `shared cache
+If using an SQLite in-memory database with SQLite, `shared cache
 <https://www.sqlite.org/sharedcache.html>`_ is enabled, so you can write tests
 with ability to share the database between threads.
 

tests/expressions_case/tests.py

@@ -5,7 +5,7 @@ from operator import attrgetter, itemgetter
 from uuid import UUID
 
 from django.core.exceptions import FieldError
-from django.db import connection, models
+from django.db import models
 from django.db.models import F, Max, Min, Q, Sum, Value
 from django.db.models.expressions import Case, When
 from django.test import TestCase
@@ -296,12 +296,6 @@ class CaseExpressionTests(TestCase):
             transform=attrgetter('integer', 'test')
         )
 
-    if connection.vendor == 'sqlite' and connection.Database.sqlite_version_info < (3, 7, 0):
-        # There is a bug in sqlite < 3.7.0, where placeholder order is lost.
-        # Thus, the above query returns  <condition_value> + <result_value>
-        # for each matching case instead of <result_value> + 1 (#24148).
-        test_combined_expression = unittest.expectedFailure(test_combined_expression)
-
     def test_in_subquery(self):
         self.assertQuerysetEqual(
             CaseTestModel.objects.filter(