Bug#32890 Crash after repeated create and drop of tables and views

The problem is that CREATE VIEW statements inside prepared statements
weren't being expanded during the prepare phase, which leads to objects
not being allocated in the appropriate memory arenas.

The solution is to perform the validation of CREATE VIEW statements
during the prepare phase of a prepared statement. The validation
during the prepare phase assures that transformations of the parsed
tree will use the permanent arena of the prepared statement.


mysql-test/r/ps.result:
  Add test case result for Bug#32890
mysql-test/t/ps.test:
  Add test case for Bug#32890
sql/item.h:
  Restore original field name if name is auto generated.
sql/sql_prepare.cc:
  Validate and prepare a CREATE VIEW statement for execution.
sql/sql_view.cc:
  Move privileges check to it's own function.
sql/sql_view.h:
  Export function which check privileges of a CREATE VIEW statement.

1 files changed, 152 insertions, 0 deletions

diff --git a/mysql-test/r/ps.result b/mysql-test/r/ps.result
index 8845f011971..32f48a688e2 100644
--- a/mysql-test/r/ps.result
+++ b/mysql-test/r/ps.result
@@ -1709,4 +1709,156 @@ a	b
 9999999999999999	14632475938453979136
 deallocate prepare stmt;
 drop table t1;
+drop view if exists v1;
+drop table if exists t1;
+create table t1 (a int, b int);
+insert into t1 values (1,1), (2,2), (3,3);
+insert into t1 values (3,1), (1,2), (2,3);
+prepare stmt from "create view v1 as select * from t1";
+execute stmt;
+drop table t1;
+create table t1 (a int, b int);
+drop view v1;
+execute stmt;
+show create view v1;
+View	Create View
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select `t1`.`a` AS `a`,`t1`.`b` AS `b` from `t1`
+drop view v1;
+prepare stmt from "create view v1 (c,d) as select a,b from t1";
+execute stmt;
+show create view v1;
+View	Create View
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select `t1`.`a` AS `c`,`t1`.`b` AS `d` from `t1`
+select * from v1;
+c	d
+drop view v1;
+execute stmt;
+deallocate prepare stmt;
+show create view v1;
+View	Create View
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select `t1`.`a` AS `c`,`t1`.`b` AS `d` from `t1`
+select * from v1;
+c	d
+drop view v1;
+prepare stmt from "create view v1 (c) as select b+1 from t1";
+execute stmt;
+show create view v1;
+View	Create View
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select (`t1`.`b` + 1) AS `c` from `t1`
+select * from v1;
+c
+drop view v1;
+execute stmt;
+deallocate prepare stmt;
+show create view v1;
+View	Create View
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select (`t1`.`b` + 1) AS `c` from `t1`
+select * from v1;
+c
+drop view v1;
+prepare stmt from "create view v1 (c,d,e,f) as select a,b,a in (select a+2 from t1), a = all (select a from t1) from t1";
+execute stmt;
+show create view v1;
+View	Create View
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select `t1`.`a` AS `c`,`t1`.`b` AS `d`,`t1`.`a` in (select (`t1`.`a` + 2) AS `a+2` from `t1`) AS `e`,`t1`.`a` = all (select `t1`.`a` AS `a` from `t1`) AS `f` from `t1`
+select * from v1;
+c	d	e	f
+drop view v1;
+execute stmt;
+deallocate prepare stmt;
+show create view v1;
+View	Create View
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select `t1`.`a` AS `c`,`t1`.`b` AS `d`,`t1`.`a` in (select (`t1`.`a` + 2) AS `a+2` from `t1`) AS `e`,`t1`.`a` = all (select `t1`.`a` AS `a` from `t1`) AS `f` from `t1`
+select * from v1;
+c	d	e	f
+drop view v1;
+prepare stmt from "create or replace view v1 as select 1";
+execute stmt;
+show create view v1;
+View	Create View
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select 1 AS `1`
+select * from v1;
+1
+1
+execute stmt;
+show create view v1;
+View	Create View
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select 1 AS `1`
+deallocate prepare stmt;
+show create view v1;
+View	Create View
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select 1 AS `1`
+select * from v1;
+1
+1
+drop view v1;
+prepare stmt from "create view v1 as select 1, 1";
+execute stmt;
+show create view v1;
+View	Create View
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select 1 AS `1`,1 AS `My_exp_1`
+select * from v1;
+1	My_exp_1
+1	1
+drop view v1;
+execute stmt;
+deallocate prepare stmt;
+show create view v1;
+View	Create View
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select 1 AS `1`,1 AS `My_exp_1`
+select * from v1;
+1	My_exp_1
+1	1
+drop view v1;
+prepare stmt from "create view v1 (x) as select a from t1 where a > 1";
+execute stmt;
+show create view v1;
+View	Create View
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select `t1`.`a` AS `x` from `t1` where (`t1`.`a` > 1)
+select * from v1;
+x
+drop view v1;
+execute stmt;
+deallocate prepare stmt;
+show create view v1;
+View	Create View
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select `t1`.`a` AS `x` from `t1` where (`t1`.`a` > 1)
+select * from v1;
+x
+drop view v1;
+prepare stmt from "create view v1 as select * from `t1` `b`";
+execute stmt;
+show create view v1;
+View	Create View
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select `b`.`a` AS `a`,`b`.`b` AS `b` from `t1` `b`
+select * from v1;
+a	b
+drop view v1;
+execute stmt;
+deallocate prepare stmt;
+show create view v1;
+View	Create View
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select `b`.`a` AS `a`,`b`.`b` AS `b` from `t1` `b`
+select * from v1;
+a	b
+drop view v1;
+prepare stmt from "create view v1 (a,b,c) as select * from t1";
+execute stmt;
+ERROR HY000: View's SELECT and view's field list have different column counts
+execute stmt;
+ERROR HY000: View's SELECT and view's field list have different column counts
+deallocate prepare stmt;
+drop table t1;
+create temporary table t1 (a int, b int);
+prepare stmt from "create view v1 as select * from t1";
+execute stmt;
+ERROR HY000: View's SELECT refers to a temporary table 't1'
+execute stmt;
+ERROR HY000: View's SELECT refers to a temporary table 't1'
+deallocate prepare stmt;
+drop table t1;
+prepare stmt from "create view v1 as select * from t1";
+ERROR 42S02: Table 'test.t1' doesn't exist
+prepare stmt from "create view v1 as select * from `t1` `b`";
+ERROR 42S02: Table 'test.t1' doesn't exist
 End of 5.0 tests.