- 修复 MySql 8.0 索引 DESC 的判断；#1664

Providers/FreeSql.Provider.MySql/MySqlCodeFirst.cs

@@ -267,7 +267,7 @@ where a.table_schema in ({0}) and a.table_name in ({1})", tboldname ?? tbname);
 select 
 a.column_name,
 a.index_name 'index_id',
-0 'IsDesc',
+case when a.collation = 'D' then 1 else 0 end 'IsDesc',
 case when a.non_unique = 0 then 1 else 0 end 'IsUnique'
 from information_schema.statistics a
 where a.table_schema IN ({0}) and a.table_name IN ({1}) and a.index_name <> 'PRIMARY'", tboldname ?? tbname);