Bug#40345 MySQLDump prefixes view name with database name when view references other db

print compact view name if the view belongs to the current database

mysql-test/r/information_schema_db.result

@@ -188,7 +188,7 @@ Field	Type	Null	Key	Default	Extra
 f1	char(4)	YES		NULL	
 show create view v2;
 View	Create View
-v2	CREATE ALGORITHM=UNDEFINED DEFINER=`testdb_2`@`localhost` SQL SECURITY DEFINER VIEW `test`.`v2` AS select `v1`.`f1` AS `f1` from `testdb_1`.`v1`
+v2	CREATE ALGORITHM=UNDEFINED DEFINER=`testdb_2`@`localhost` SQL SECURITY DEFINER VIEW `v2` AS select `v1`.`f1` AS `f1` from `testdb_1`.`v1`
 show create view testdb_1.v1;
 ERROR 42000: SHOW VIEW command denied to user 'testdb_2'@'localhost' for table 'v1'
 select table_name from information_schema.columns a 

mysql-test/r/mysqldump.result

@@ -3246,7 +3246,7 @@ USE `mysqldump_views`;
 /*!50001 DROP TABLE `nasishnasifu`*/;
 /*!50001 CREATE ALGORITHM=UNDEFINED */
 /*!50013 DEFINER=`root`@`localhost` SQL SECURITY DEFINER */
-/*!50001 VIEW `mysqldump_views`.`nasishnasifu` AS select `mysqldump_tables`.`basetable`.`id` AS `id` from `mysqldump_tables`.`basetable` */;
+/*!50001 VIEW `nasishnasifu` AS select `mysqldump_tables`.`basetable`.`id` AS `id` from `mysqldump_tables`.`basetable` */;
 drop view nasishnasifu;
 drop database mysqldump_views;
 drop table mysqldump_tables.basetable;

mysql-test/r/view_grant.result

@@ -26,7 +26,7 @@ create view v2 as select * from mysqltest.t2;
 ERROR 42000: ANY command denied to user 'mysqltest_1'@'localhost' for table 't2'
 show create view v1;
 View	Create View
-v1	CREATE ALGORITHM=UNDEFINED DEFINER=`mysqltest_1`@`localhost` SQL SECURITY DEFINER VIEW `test`.`v1` AS select `mysqltest`.`t1`.`a` AS `a`,`mysqltest`.`t1`.`b` AS `b` from `mysqltest`.`t1`
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`mysqltest_1`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select `mysqltest`.`t1`.`a` AS `a`,`mysqltest`.`t1`.`b` AS `b` from `mysqltest`.`t1`
 grant create view,drop,select on test.* to mysqltest_1@localhost;
 use test;
 alter view v1 as select * from mysqltest.t1;
@@ -307,7 +307,7 @@ grant create view,select on test.* to mysqltest_1@localhost;
 create view v1 as select * from mysqltest.t1;
 show create view v1;
 View	Create View
-v1	CREATE ALGORITHM=UNDEFINED DEFINER=`mysqltest_1`@`localhost` SQL SECURITY DEFINER VIEW `test`.`v1` AS select `mysqltest`.`t1`.`a` AS `a`,`mysqltest`.`t1`.`b` AS `b` from `mysqltest`.`t1`
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`mysqltest_1`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select `mysqltest`.`t1`.`a` AS `a`,`mysqltest`.`t1`.`b` AS `b` from `mysqltest`.`t1`
 revoke select on mysqltest.t1 from mysqltest_1@localhost;
 select * from v1;
 ERROR HY000: View 'test.v1' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them

sql/sql_show.cc

@@ -1232,21 +1232,25 @@ void append_definer(THD *thd, String *buffer, const LEX_STRING *definer_user,
 static int
 view_store_create_info(THD *thd, TABLE_LIST *table, String *buff)
 {
+  my_bool compact_view_name= TRUE;
   my_bool foreign_db_mode= (thd->variables.sql_mode & (MODE_POSTGRESQL |
                                                        MODE_ORACLE |
                                                        MODE_MSSQL |
                                                        MODE_DB2 |
                                                        MODE_MAXDB |
                                                        MODE_ANSI)) != 0;
+
+  if (!thd->db || strcmp(thd->db, table->view_db.str))
     /*
-     Compact output format for view can be used
-     - if user has db of this view as current db
-     - if this view only references table inside it's own db
+      print compact view name if the view belongs to the current database
     */
-  if (!thd->db || strcmp(thd->db, table->view_db.str))
-    table->compact_view_format= FALSE;
+    compact_view_name= table->compact_view_format= FALSE;
   else
   {
+    /*
+      Compact output format for view body can be used
+      if this view only references table inside it's own db
+    */
     TABLE_LIST *tbl;
     table->compact_view_format= TRUE;
     for (tbl= thd->lex->query_tables;
@@ -1267,7 +1271,7 @@ view_store_create_info(THD *thd, TABLE_LIST *table, String *buff)
     view_store_options(thd, table, buff);
   }
   buff->append(STRING_WITH_LEN("VIEW "));
-  if (!table->compact_view_format)
+  if (!compact_view_name)
   {
     append_identifier(thd, buff, table->view_db.str, table->view_db.length);
     buff->append('.');