BUG#26881798: SERVER EXITS WHEN PRIMARY KEY IN MYSQL.PROC IS DROPPED

test case

mysql-test/r/sp-destruct.result

@@ -174,3 +174,9 @@ create database mysqltest1;
 create procedure mysqltest1.foo() select "foo";
 update mysql.proc set name='' where db='mysqltest1';
 drop database mysqltest1;
+create procedure p1() set @foo = 10;
+alter table mysql.proc drop primary key;
+drop procedure p1;
+ERROR HY000: Cannot load from mysql.proc. The table is probably corrupted
+alter table mysql.proc add primary key (db,name,type);
+drop procedure p1;

mysql-test/t/sp-destruct.test

@@ -289,3 +289,13 @@ create database mysqltest1;
 create procedure mysqltest1.foo() select "foo";
 update mysql.proc set name='' where db='mysqltest1';
 drop database mysqltest1;
+
+#
+# BUG#26881798: SERVER EXITS WHEN PRIMARY KEY IN MYSQL.PROC IS DROPPED
+#
+create procedure p1() set @foo = 10;
+alter table mysql.proc drop primary key;
+--error ER_CANNOT_LOAD_FROM_TABLE
+drop procedure p1;
+alter table mysql.proc add primary key (db,name,type);
+drop procedure p1;