From 407d3cf39cd6a62f7277e401d646a4c7e8446879 Mon Sep 17 00:00:00 2001
From: Mariusz Felisiak <felisiak.mariusz@gmail.com>
Date: Mon, 11 Jan 2021 11:45:20 +0100
Subject: [PATCH] Fixed #32342 -- Added index order introspection on MySQL
 8.0.1+.

---
 django/db/backends/mysql/features.py      |  8 +++++++-
 django/db/backends/mysql/introspection.py | 10 +++++++++-
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/django/db/backends/mysql/features.py b/django/db/backends/mysql/features.py
index 72fff72648c..0840a4cf6bc 100644
--- a/django/db/backends/mysql/features.py
+++ b/django/db/backends/mysql/features.py
@@ -14,7 +14,6 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     supports_forward_references = False
     supports_regex_backreferencing = False
     supports_date_lookup_using_string = False
-    supports_index_column_ordering = False
     supports_timezones = False
     requires_explicit_null_ordering_when_grouping = True
     can_release_savepoints = True
@@ -219,3 +218,10 @@ class DatabaseFeatures(BaseDatabaseFeatures):
         if self.connection.mysql_is_mariadb:
             return self.supports_json_field and self.can_introspect_check_constraints
         return self.supports_json_field
+
+    @cached_property
+    def supports_index_column_ordering(self):
+        return (
+            not self.connection.mysql_is_mariadb and
+            self.connection.mysql_version >= (8, 0, 1)
+        )
diff --git a/django/db/backends/mysql/introspection.py b/django/db/backends/mysql/introspection.py
index 4c0178144a4..649df5c6d99 100644
--- a/django/db/backends/mysql/introspection.py
+++ b/django/db/backends/mysql/introspection.py
@@ -229,6 +229,8 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
                     'check': False,
                     'foreign_key': (ref_table, ref_column) if ref_column else None,
                 }
+                if self.connection.features.supports_index_column_ordering:
+                    constraints[constraint]['orders'] = []
             constraints[constraint]['columns'].add(column)
         # Now get the constraint types
         type_query = """
@@ -289,7 +291,9 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
                 }
         # Now add in the indexes
         cursor.execute("SHOW INDEX FROM %s" % self.connection.ops.quote_name(table_name))
-        for table, non_unique, index, colseq, column, type_ in [x[:5] + (x[10],) for x in cursor.fetchall()]:
+        for table, non_unique, index, colseq, column, order, type_ in [
+            x[:6] + (x[10],) for x in cursor.fetchall()
+        ]:
             if index not in constraints:
                 constraints[index] = {
                     'columns': OrderedSet(),
@@ -298,9 +302,13 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
                     'check': False,
                     'foreign_key': None,
                 }
+                if self.connection.features.supports_index_column_ordering:
+                    constraints[index]['orders'] = []
             constraints[index]['index'] = True
             constraints[index]['type'] = Index.suffix if type_ == 'BTREE' else type_.lower()
             constraints[index]['columns'].add(column)
+            if self.connection.features.supports_index_column_ordering:
+                constraints[index]['orders'].append('DESC' if order == 'D' else 'ASC')
         # Convert the sorted sets to lists
         for constraint in constraints.values():
             constraint['columns'] = list(constraint['columns'])