Refs #26167 -- SQLite3 supports expression indexes as of 3.9.0

django/db/backends/sqlite3/features.py

@@ -40,6 +40,10 @@ def uses_savepoints(self):
     def supports_index_column_ordering(self):
         return Database.sqlite_version_info >= (3, 3, 0)
 
+    @cached_property
+    def supports_expression_indexes(self):
+        return Database.sqlite_version_info >= (3, 9, 0)
+
     @cached_property
     def can_release_savepoints(self):
         return self.uses_savepoints

django/db/models/indexes.py

@@ -70,7 +70,7 @@ def get_sql_create_template_values(self, model, schema_editor, using):
                         'Not creating expression index:\n'
                         '   {expression}\n'
                         'Expression indexes are not supported on {vendor}.'
-                    ).format(expression=column_expression, vendor=connection.vendor),
+                    ).format(expression=column_expression, vendor=connection.display_name),
                 )
 
             expression = column_expression.resolve_expression(query)

docs/ref/models/indexes.txt

@@ -71,6 +71,11 @@ allows constructing indexes on mathematical operations.
     :MySQL:
         MySQL doesn't support expression indexes as of version 5.7.
 
+    :SQLite3:
+        "*The ability to index expressions was added to SQLite with version
+        3.9.0 (2015-10-14)*" --- `SQLite3 documentation
+        <https://sqlite.org/expridx.html#compatibility>`_.
+
     :Oracle:
         Oracle Database requires "*that any schema-level or package-level
         PL/SQL function that the index expression invokes is deterministic