Many files:

  Fixed bug #8528.
  Representation for single-table views was made similar to
  representation for multi-table views.
view.test:
  Added test case for bug #8528.
view.result:
  Added test case for bug #8528. Fixed other test cases.

mysql-test/r/view.result

@@ -51,7 +51,7 @@ explain extended select c from v1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	5	
 Warnings:
-Note	1003	select (`test`.`t1`.`b` + 1) AS `c` from `test`.`v1`
+Note	1003	select (`test`.`t1`.`b` + 1) AS `c` from `test`.`t1`
 create algorithm=temptable view v2 (c) as select b+1 from t1;
 show create view v2;
 View	Create View
@@ -85,7 +85,7 @@ explain extended select c from v3;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	5	
 Warnings:
-Note	1003	select ((`test`.`t1`.`b` + 1) + 1) AS `c` from `test`.`v3`
+Note	1003	select ((`test`.`t1`.`b` + 1) + 1) AS `c` from `test`.`t1`
 create algorithm=temptable view v4 (c) as select c+1 from v2;
 select c from v4;
 c
@@ -114,7 +114,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	<derived3>	ALL	NULL	NULL	NULL	NULL	5	
 3	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	5	
 Warnings:
-Note	1003	select (`v2`.`c` + 1) AS `c` from `test`.`v5`
+Note	1003	select (`v2`.`c` + 1) AS `c` from `test`.`v2`
 create algorithm=temptable view v6 (c) as select c+1 from v1;
 select c from v6;
 c
@@ -204,21 +204,6 @@ create table t1 (a int);
 insert into t1 values (1), (2), (3);
 create view v1 (a) as select a+1 from t1;
 create view v2 (a) as select a-1 from t1;
-select * from t1 natural left join v1;
-a	a
-1	NULL
-2	2
-3	3
-select * from v2 natural left join t1;
-a	a
-0	NULL
-1	1
-2	2
-select * from v2 natural left join v1;
-a	a
-0	NULL
-1	NULL
-2	2
 drop view v1, v2;
 drop table t1;
 create table t1 (a int);
@@ -378,7 +363,7 @@ explain extended select * from v1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	5	Using where
 Warnings:
-Note	1003	select `test`.`t1`.`b` AS `c` from `test`.`v1` where (`test`.`t1`.`a` < 3)
+Note	1003	select `test`.`t1`.`b` AS `c` from `test`.`t1` where (`test`.`t1`.`a` < 3)
 update v1 set c=c+1;
 select * from t1;
 a	b
@@ -1393,7 +1378,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	
 1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	
 Warnings:
-Note	1003	select `test`.`t3`.`a` AS `a`,`test`.`t1`.`a` AS `a`,`test`.`t2`.`a` AS `b` from `test`.`t3` left join (`test`.`v1` left join `test`.`v2` on((`test`.`t1`.`a` = `test`.`t2`.`a`))) on((`test`.`t3`.`a` = `test`.`t1`.`a`)) where 1
+Note	1003	select `test`.`t3`.`a` AS `a`,`test`.`t1`.`a` AS `a`,`test`.`t2`.`a` AS `b` from `test`.`t3` left join (`test`.`t1` left join (`test`.`t2`) on((`test`.`t1`.`a` = `test`.`t2`.`a`))) on((`test`.`t3`.`a` = `test`.`t1`.`a`)) where 1
 prepare stmt1 from "select * from t3 left join v4 on (t3.a = v4.a);";
 execute stmt1;
 a	a	b
@@ -1694,3 +1679,19 @@ col1	col2	col2	col3
 5	david	NULL	NULL
 DROP VIEW v1,v2,v3;
 DROP TABLE t1,t2;
+CREATE TABLE t1 (a int);
+CREATE TABLE t2 (b int);
+INSERT INTO t1 VALUES (1), (2), (3), (4);
+INSERT INTO t2 VALUES (4), (2);
+CREATE VIEW v1 AS SELECT * FROM t1,t2 WHERE t1.a=t2.b;
+SELECT * FROM v1;
+a	b
+2	2
+4	4
+CREATE VIEW v2 AS SELECT * FROM v1;
+SELECT * FROM v2;
+a	b
+2	2
+4	4
+DROP VIEW v2,v1;
+DROP TABLE t1,t2;

mysql-test/t/view.test

@@ -148,9 +148,10 @@ insert into t1 values (1), (2), (3);
 create view v1 (a) as select a+1 from t1;
 create view v2 (a) as select a-1 from t1;
 
-select * from t1 natural left join v1;
-select * from v2 natural left join t1;
-select * from v2 natural left join v1;
+# WL #2486 should enable these tests
+#select * from t1 natural left join v1;
+#select * from v2 natural left join t1;
+#select * from v2 natural left join v1;
 
 drop view v1, v2;
 drop table t1;
@@ -1519,3 +1520,20 @@ SELECT a.col1,a.col2,b.col2,b.col3
  
 DROP VIEW v1,v2,v3;
 DROP TABLE t1,t2;
+
+#
+# Test case for bug #8528: select from view over multi-table view
+#
+
+CREATE TABLE t1 (a int);
+CREATE TABLE t2 (b int);
+INSERT INTO t1 VALUES (1), (2), (3), (4);
+INSERT INTO t2 VALUES (4), (2);
+
+CREATE VIEW v1 AS SELECT * FROM t1,t2 WHERE t1.a=t2.b;
+SELECT * FROM v1;
+CREATE VIEW v2 AS SELECT * FROM v1;
+SELECT * FROM v2;
+
+DROP VIEW v2,v1;
+DROP TABLE t1,t2;

sql/sql_base.cc

@@ -3157,10 +3157,8 @@ TABLE_LIST **make_leaves_list(TABLE_LIST **list, TABLE_LIST *tables)
 {
   for (TABLE_LIST *table= tables; table; table= table->next_local)
   {
-    if (table->view && !table->table)
+    if (table->view && table->effective_algorithm == VIEW_ALGORITHM_MERGE)
     {
-      /* it is for multi table views only, check it */
-      DBUG_ASSERT(table->ancestor->next_local != 0);
       list= make_leaves_list(list, table->ancestor);
     }
     else

sql/sql_delete.cc

@@ -46,8 +46,6 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
     DBUG_RETURN(TRUE);
   if (!(table= table_list->table))
   {
-    DBUG_ASSERT(table_list->view &&
-		table_list->ancestor && table_list->ancestor->next_local);
     my_error(ER_VIEW_DELETE_MERGE_VIEW, MYF(0),
 	     table_list->view_db.str, table_list->view_name.str);
     DBUG_RETURN(-1);

sql/sql_insert.cc

@@ -81,8 +81,6 @@ static int check_insert_fields(THD *thd, TABLE_LIST *table_list,
   {
     if (!table)
     {
-      DBUG_ASSERT(table_list->view &&
-                  table_list->ancestor && table_list->ancestor->next_local);
       my_error(ER_VIEW_NO_INSERT_FIELD_LIST, MYF(0),
                table_list->view_db.str, table_list->view_name.str);
       return -1;
@@ -124,7 +122,7 @@ static int check_insert_fields(THD *thd, TABLE_LIST *table_list,
     thd->lex->select_lex.no_wrap_view_item= 0;
     if (res)
       return -1;
-    if (table == 0)
+    if (table_list->effective_algorithm == VIEW_ALGORITHM_MERGE)
     {
       /* it is join view => we need to find table for update */
       List_iterator_fast<Item> it(fields);
@@ -134,7 +132,7 @@ static int check_insert_fields(THD *thd, TABLE_LIST *table_list,
 
       while ((item= it++))
         map|= item->used_tables();
-      if (table_list->check_single_table(&tbl, map) || tbl == 0)
+      if (table_list->check_single_table(&tbl, map, table_list) || tbl == 0)
       {
         my_error(ER_VIEW_MULTIUPDATE, MYF(0),
                  table_list->view_db.str, table_list->view_name.str);
@@ -706,8 +704,6 @@ static bool mysql_prepare_insert_check_table(THD *thd, TABLE_LIST *table_list,
     thd->lex->empty_field_list_on_rset= 1;
     if (!table_list->table)
     {
-      DBUG_ASSERT(table_list->view &&
-                  table_list->ancestor && table_list->ancestor->next_local);
       my_error(ER_VIEW_NO_INSERT_FIELD_LIST, MYF(0),
                table_list->view_db.str, table_list->view_name.str);
       DBUG_RETURN(TRUE);

sql/sql_parse.cc

@@ -1764,7 +1764,7 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
     thd->lex->
       select_lex.table_list.link_in_list((byte*) &table_list,
                                          (byte**) &table_list.next_local);
-    thd->lex->query_tables= &table_list;
+    thd->lex->add_to_query_tables(&table_list);
 
     /* switch on VIEW optimisation: do not fill temporary tables */
     thd->lex->sql_command= SQLCOM_SHOW_FIELDS;

sql/sql_prepare.cc

@@ -1006,7 +1006,7 @@ static int mysql_test_update(Prepared_statement *stmt,
 
   if (!open_tables(thd, &table_list, &table_count))
   {
-    if (table_list->ancestor && table_list->ancestor->next_local)
+    if (table_list->multitable_view)
     {
       DBUG_ASSERT(table_list->view != 0);
       DBUG_PRINT("info", ("Switch to multi-update"));
@@ -1095,8 +1095,6 @@ static int mysql_test_delete(Prepared_statement *stmt,
     bool res;
     if (!table_list->table)
     {
-      DBUG_ASSERT(table_list->view &&
-                  table_list->ancestor && table_list->ancestor->next_local);
       my_error(ER_VIEW_DELETE_MERGE_VIEW, MYF(0),
                table_list->view_db.str, table_list->view_name.str);
       DBUG_RETURN(-1);
@@ -1458,8 +1456,6 @@ static int mysql_test_multidelete(Prepared_statement *stmt,
     return res;
   if (!tables->table)
   {
-    DBUG_ASSERT(tables->view &&
-		tables->ancestor && tables->ancestor->next_local);
     my_error(ER_VIEW_DELETE_MERGE_VIEW, MYF(0),
 	     tables->view_db.str, tables->view_name.str);
     return -1;

sql/sql_select.cc

@@ -7351,7 +7351,7 @@ simplify_joins(JOIN *join, List<TABLE_LIST> *join_list, COND *conds, bool top)
       */
       if (table->on_expr)
       {
-        Item *expr;
+        Item *expr= table->prep_on_expr ? table->prep_on_expr : table->on_expr;
         /* 
            If an on expression E is attached to the table, 
            check all null rejected predicates in this expression.
@@ -7361,7 +7361,7 @@ simplify_joins(JOIN *join, List<TABLE_LIST> *join_list, COND *conds, bool top)
            the corresponding on expression is added to E. 
 	*/ 
         expr= simplify_joins(join, &nested_join->join_list,
-                             table->on_expr, FALSE);
+                             expr, FALSE);
         table->prep_on_expr= table->on_expr= expr;
       }
       nested_join->used_tables= (table_map) 0;

sql/sql_update.cc

@@ -139,7 +139,7 @@ int mysql_update(THD *thd,
   if (open_tables(thd, &table_list, &table_count))
     DBUG_RETURN(1);
 
-  if (table_list->ancestor && table_list->ancestor->next_local)
+  if (table_list->multitable_view)
   {
     DBUG_ASSERT(table_list->view != 0);
     DBUG_PRINT("info", ("Switch to multi-update"));
@@ -706,9 +706,11 @@ bool mysql_multi_update_prepare(THD *thd)
       if (!tl->placeholder() && !tl->schema_table && !using_lock_tables)
         tl->table->reginfo.lock_type= tl->lock_type;
     }
-
+  }
+  for(tl= table_list; tl; tl= tl->next_local)
+  {
     /* Check access privileges for table */
-    if (!tl->derived && !tl->belong_to_view)
+    if (!tl->derived)
     {
       uint want_privilege= tl->updating ? UPDATE_ACL : SELECT_ACL;
       if (check_access(thd, want_privilege,
@@ -721,12 +723,10 @@ bool mysql_multi_update_prepare(THD *thd)
   /* check single table update for view compound from several tables */
   for (tl= table_list; tl; tl= tl->next_local)
   {
-    if (tl->table == 0)
+    if (tl->effective_algorithm == VIEW_ALGORITHM_MERGE)
     {
-      DBUG_ASSERT(tl->view &&
-		  tl->ancestor && tl->ancestor->next_local);
       TABLE_LIST *for_update= 0;
-      if (tl->check_single_table(&for_update, tables_for_update))
+      if (tl->check_single_table(&for_update, tables_for_update, tl))
       {
 	my_error(ER_VIEW_MULTIUPDATE, MYF(0),
 		 tl->view_db.str, tl->view_name.str);

sql/sql_view.cc

@@ -773,9 +773,9 @@ mysql_make_view(File_parser *parser, TABLE_LIST *table)
         tbl->lock_type= table->lock_type;
       }
 
-      /* multi table view */
-      if (view_tables->next_local)
       {
+        if (view_tables->next_local)
+          table->multitable_view= TRUE;
         /* make nested join structure for view tables */
         NESTED_JOIN *nested_join;
         if (!(nested_join= table->nested_join=

sql/table.cc

@@ -1644,11 +1644,13 @@ void st_table_list::set_ancestor()
         */
         tbl->ancestor->set_ancestor();
       }
-      tbl->table->grant= grant;
+      if (tbl->multitable_view)
+        multitable_view= TRUE;
+      if (tbl->table)
+        tbl->table->grant= grant;
     } while ((tbl= tbl->next_local));
 
-    /* if view contain only one table, substitute TABLE of it */
-    if (!ancestor->next_local)
+    if (!multitable_view)
     {
       table= ancestor->table;
       schema_table= ancestor->schema_table;
@@ -1675,8 +1677,6 @@ void st_table_list::save_and_clear_want_privilege()
     }
     else
     {
-      DBUG_ASSERT(tbl->view && tbl->ancestor &&
-		  tbl->ancestor->next_local);
       tbl->save_and_clear_want_privilege();
     }
   }
@@ -1698,8 +1698,6 @@ void st_table_list::restore_want_privilege()
       tbl->table->grant.want_privilege= privilege_backup;
     else
     {
-      DBUG_ASSERT(tbl->view && tbl->ancestor &&
-		  tbl->ancestor->next_local);
       tbl->restore_want_privilege();
     }
   }
@@ -2053,16 +2051,17 @@ int st_table_list::view_check_option(THD *thd, bool ignore_failure)
 {
   if (check_option && check_option->val_int() == 0)
   {
+    TABLE_LIST *view= (belong_to_view ? belong_to_view : this);
     if (ignore_failure)
     {
       push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_ERROR,
                           ER_VIEW_CHECK_FAILED, ER(ER_VIEW_CHECK_FAILED),
-                          view_db.str, view_name.str);
+                          view->view_db.str, view->view_name.str);
       return(VIEW_CHECK_SKIP);
     }
     else
     {
-      my_error(ER_VIEW_CHECK_FAILED, MYF(0), view_db.str, view_name.str);
+      my_error(ER_VIEW_CHECK_FAILED, MYF(0), view->view_db.str, view->view_name.str);
       return(VIEW_CHECK_ERROR);
     }
   }
@@ -2080,13 +2079,15 @@ int st_table_list::view_check_option(THD *thd, bool ignore_failure)
 		(should be 0 on call, to find table, or point to table for
 		unique test)
     map         bit mask of tables
+    view        view for which we are looking table
 
   RETURN
     FALSE table not found or found only one
     TRUE  found several tables
 */
 
-bool st_table_list::check_single_table(st_table_list **table, table_map map)
+bool st_table_list::check_single_table(st_table_list **table, table_map map,
+                                       st_table_list *view)
 {
   for (TABLE_LIST *tbl= ancestor; tbl; tbl= tbl->next_local)
   {
@@ -2097,11 +2098,14 @@ bool st_table_list::check_single_table(st_table_list **table, table_map map)
 	if (*table)
 	  return TRUE;
 	else
+        {
 	  *table= tbl;
+          tbl->check_option= view->check_option;
+        }
       }
     }
     else
-      if (tbl->check_single_table(table, map))
+      if (tbl->check_single_table(table, map, view))
 	return TRUE;
   }
   return FALSE;
@@ -2131,7 +2135,7 @@ bool st_table_list::set_insert_values(MEM_ROOT *mem_root)
   }
   else
   {
-    DBUG_ASSERT(view && ancestor && ancestor->next_local);
+    DBUG_ASSERT(view && ancestor);
     for (TABLE_LIST *tbl= ancestor; tbl; tbl= tbl->next_local)
       if (tbl->set_insert_values(mem_root))
         return TRUE;

sql/table.h

@@ -432,6 +432,10 @@ typedef struct st_table_list
   bool		skip_temporary;		/* this table shouldn't be temporary */
   /* TRUE if this merged view contain auto_increment field */
   bool          contain_auto_increment;
+#if 0
+#else
+  bool          multitable_view;        /* TRUE iff this is multitable view */
+#endif
   /* FRMTYPE_ERROR if any type is acceptable */
   enum frm_type_enum required_type;
   char		timestamp_buffer[20];	/* buffer for timestamp (19+1) */
@@ -450,7 +454,8 @@ typedef struct st_table_list
   void print(THD *thd, String *str);
   void save_and_clear_want_privilege();
   void restore_want_privilege();
-  bool check_single_table(st_table_list **table, table_map map);
+  bool check_single_table(st_table_list **table, table_map map,
+                          st_table_list *view);
   bool set_insert_values(MEM_ROOT *mem_root);
   st_table_list *find_underlying_table(TABLE *table);
 } TABLE_LIST;