MDEV-14692 Server crash in MDL_ticket::has_stronger_or_equal_type

SQL: disable system-versioning stuff on TEMPORARY tables

mysql-test/suite/versioning/r/alter.result

@@ -426,5 +426,11 @@ create or replace table t1 (pk int auto_increment unique) with system versioning
 insert into t1 values (1);
 delete from t1;
 alter table t1 engine=myisam;
+# MDEV-14692 crash in MDL_context::upgrade_shared_lock()
+create or replace temporary table t (a int);
+alter table t change column if exists b c bigint unsigned generated always as row start;
+ERROR HY000: GENERATED AS ROW START prohibited for TEMPORARY tables
+alter table t change column if exists b c bigint unsigned generated always as row end;
+ERROR HY000: GENERATED AS ROW END prohibited for TEMPORARY tables
 drop database test;
 create database test;

mysql-test/suite/versioning/r/create.result

@@ -344,7 +344,7 @@ create or replace table t (sys_trx_end int);
 alter table t with system versioning;
 ERROR 42S21: Duplicate column name 'sys_trx_end'
 create or replace temporary table t (x28 int) with system versioning;
-ERROR HY000: Incorrect usage of TEMPORARY and WITH SYSTEM VERSIONING
+ERROR HY000: WITH SYSTEM VERSIONING prohibited for TEMPORARY tables
 create or replace table t1 (
 x29 int unsigned,
 Sys_start0 timestamp(6) as row start invisible,

mysql-test/suite/versioning/t/alter.test

@@ -362,5 +362,13 @@ insert into t1 values (1);
 delete from t1;
 alter table t1 engine=myisam;
 
+--echo # MDEV-14692 crash in MDL_context::upgrade_shared_lock()
+create or replace temporary table t (a int);
+--error ER_VERS_TEMPORARY
+alter table t change column if exists b c bigint unsigned generated always as row start;
+--error ER_VERS_TEMPORARY
+alter table t change column if exists b c bigint unsigned generated always as row end;
+
+
 drop database test;
 create database test;

mysql-test/suite/versioning/t/create.test

@@ -313,7 +313,7 @@ create or replace table t (sys_trx_end int);
 --error ER_DUP_FIELDNAME
 alter table t with system versioning;
 
---error ER_WRONG_USAGE
+--error ER_VERS_TEMPORARY
 create or replace temporary table t (x28 int) with system versioning;
 
 --error ER_VERS_DUPLICATE_ROW_START_END

sql/handler.cc

@@ -7188,9 +7188,14 @@ bool Vers_parse_info::fix_alter_info(THD *thd, Alter_info *alter_info,
     List_iterator_fast<Create_field> it(alter_info->create_list);
     while (Create_field *f= it++)
     {
-      if (f->change.length &&
-          f->flags & (VERS_SYS_START_FLAG | VERS_SYS_END_FLAG))
+      if (f->change.length && f->flags & VERS_SYSTEM_FIELD)
       {
+        if (share->table_category == TABLE_CATEGORY_TEMPORARY) {
+          my_error(ER_VERS_TEMPORARY, MYF(0),
+                   f->flags & VERS_SYS_START_FLAG ? "GENERATED AS ROW START"
+                                                  : "GENERATED AS ROW END");
+          return true;
+        }
         if (thd->mdl_context.upgrade_shared_lock(
                 table->mdl_ticket, MDL_EXCLUSIVE,
                 thd->variables.lock_wait_timeout))

sql/share/errmsg-utf8.txt

@@ -7932,3 +7932,6 @@ WARN_VERS_TRT_EXPERIMENTAL
 
 ER_VERS_TRUNCATE_VIEW
         eng "DELETE HISTORY from VIEW is prohibited"
+
+ER_VERS_TEMPORARY
+	eng "%s prohibited for TEMPORARY tables"

sql/sql_yacc.yy

@@ -6235,8 +6235,7 @@ versioning_option:
             {
               if (!thd->variables.vers_force)
               {
-                my_error(ER_WRONG_USAGE, MYF(0),
-                         "TEMPORARY", "WITH SYSTEM VERSIONING");
+                my_error(ER_VERS_TEMPORARY, MYF(0), "WITH SYSTEM VERSIONING");
                 MYSQL_YYABORT;
               }
             }