MDEV-22906 Disallow system_versioning_asof in DML

system_versioning_asof does not influence on multi-delete,
multi-update, insert-select, replace-select.

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

@@ -146,3 +146,32 @@ show status like "Feature_system_versioning";
 Variable_name	Value
 Feature_system_versioning	2
 drop table t;
+#
+# MDEV-22906 Disallow system_versioning_asof in DML
+#
+create or replace table t1 (x int) with system versioning;
+create or replace table t2 (y int);
+insert into t1 values (1);
+insert into t2 values (1);
+set system_versioning_asof= '1970-01-01 00:00:00';
+delete t1, t2 from t1 join t2 where t1.x = t2.y;
+select * from t1 for system_time as of timestamp now(6);
+x
+insert into t1 values (1);
+insert into t2 values (1);
+update t1, t2 set x= 2, y= 2 where x = y;
+select * from t1 for system_time as of timestamp now(6);
+x
+2
+replace t2 select x + 1 from t1;
+select * from t2;
+y
+2
+3
+insert t2 select x + 2 from t1;
+select * from t2;
+y
+2
+3
+4
+drop tables t1, t2;

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

@@ -103,3 +103,27 @@ select * from t for system_time between '1970-01-01 00:00' and current_timestamp
 show status like "Feature_system_versioning";
 
 drop table t;
+
+--echo #
+--echo # MDEV-22906 Disallow system_versioning_asof in DML
+--echo #
+create or replace table t1 (x int) with system versioning;
+create or replace table t2 (y int);
+insert into t1 values (1);
+insert into t2 values (1);
+set system_versioning_asof= '1970-01-01 00:00:00';
+delete t1, t2 from t1 join t2 where t1.x = t2.y;
+select * from t1 for system_time as of timestamp now(6);
+
+insert into t1 values (1);
+insert into t2 values (1);
+update t1, t2 set x= 2, y= 2 where x = y;
+select * from t1 for system_time as of timestamp now(6);
+
+replace t2 select x + 1 from t1;
+select * from t2;
+
+insert t2 select x + 2 from t1;
+select * from t2;
+
+drop tables t1, t2;

sql/sql_select.cc

@@ -778,9 +778,12 @@ int SELECT_LEX::vers_setup_conds(THD *thd, TABLE_LIST *tables)
   }
 
   bool is_select= false;
+  bool use_sysvar= false;
   switch (thd->lex->sql_command)
   {
   case SQLCOM_SELECT:
+    use_sysvar= true;
+    /* fall through */
   case SQLCOM_INSERT_SELECT:
   case SQLCOM_REPLACE_SELECT:
   case SQLCOM_DELETE_MULTI:
@@ -824,7 +827,7 @@ int SELECT_LEX::vers_setup_conds(THD *thd, TABLE_LIST *tables)
     }
 
     // propagate system_time from sysvar
-    if (!vers_conditions.is_set() && is_select)
+    if (!vers_conditions.is_set() && use_sysvar)
     {
       if (vers_conditions.init_from_sysvar(thd))
         DBUG_RETURN(-1);