Merge branch 'feature/1106_homework' into dev

mec-biz/src/main/resources/config/mybatis/ExtracurricularExercisesMapper.xml

@@ -406,7 +406,8 @@
             null as assignTime,
             null as expiryDate,
             null as studentIdList,
-            null as teacherId
+            null as teacherId,
+            null as fileExpireDay
             from music_group
             where id_ in
             <foreach collection="subjectIds" item="item" separator="," open="(" close=")">