MDEV-24314 Unexpected error message when selecting from view that uses

           mergeable derived table

Do not check privileges for derived tables/CTEs and their fields.

Approved by Oleksandr Byelkin <sanja@mariadb.com>

mysql-test/r/view.result

@@ -6767,5 +6767,40 @@ DROP PROCEDURE sp;
 DROP VIEW v1;
 DROP TABLE t1;
 #
+# MDEV-24314: create view with derived table without default database
+#
+drop database test;
+create database db1;
+create table db1.t1 (a int);
+insert into db1.t1 values (3),(7),(1);
+create view db1.v1 as select * from (select * from db1.t1) t;
+show create view db1.v1;
+View	Create View	character_set_client	collation_connection
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `db1`.`v1` AS select `t`.`a` AS `a` from (select `db1`.`t1`.`a` AS `a` from `db1`.`t1`) `t`	latin1	latin1_swedish_ci
+select * from db1.v1;
+a
+3
+7
+1
+drop view db1.v1;
+prepare stmt from "
+create view db1.v1 as select * from (select * from db1.t1) t;
+";
+execute stmt;
+deallocate prepare stmt;
+show create view db1.v1;
+View	Create View	character_set_client	collation_connection
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `db1`.`v1` AS select `t`.`a` AS `a` from (select `db1`.`t1`.`a` AS `a` from `db1`.`t1`) `t`	latin1	latin1_swedish_ci
+select * from db1.v1;
+a
+3
+7
+1
+drop view db1.v1;
+drop table db1.t1;
+drop database db1;
+create database test;
+use test;
+#
 # End of 10.2 tests
 #

mysql-test/t/view.test

@@ -6491,6 +6491,36 @@ DROP PROCEDURE sp;
 DROP VIEW v1;
 DROP TABLE t1;
 
+--echo #
+--echo # MDEV-24314: create view with derived table without default database
+--echo #
+
+drop database test;
+
+create database db1;
+create table db1.t1 (a int);
+insert into db1.t1 values (3),(7),(1);
+
+create view db1.v1 as select * from (select * from db1.t1) t;
+show create view db1.v1;
+select * from db1.v1;
+drop view db1.v1;
+
+prepare stmt from "
+create view db1.v1 as select * from (select * from db1.t1) t;
+";
+execute stmt;
+deallocate prepare stmt;
+show create view db1.v1;
+select * from db1.v1;
+drop view db1.v1;
+
+drop table db1.t1;
+drop database db1;
+
+create database test;
+use test;
+
 --echo #
 --echo # End of 10.2 tests
 --echo #

sql/sql_base.cc

@@ -5795,6 +5795,7 @@ find_field_in_table_ref(THD *thd, TABLE_LIST *table_list,
 #ifndef NO_EMBEDDED_ACCESS_CHECKS
     /* Check if there are sufficient access rights to the found field. */
     if (check_privileges &&
+        !table_list->is_derived() &&
         check_column_grant_in_table_ref(thd, *actual_table, name, length))
       fld= WRONG_GRANT;
     else

sql/sql_parse.cc

@@ -6639,6 +6639,9 @@ check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
 bool check_single_table_access(THD *thd, ulong privilege, TABLE_LIST *tables,
                                bool no_errors)
 {
+  if (tables->is_derived())
+    return 0;
+
   Switch_to_definer_security_ctx backup_sctx(thd, tables);
 
   const char *db_name;