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Fix for bug #10055 "Using stored function with information_schema causes empty

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result set".

To enable full access to contents of I_S tables from stored functions
or statements that use them, we manipulate with thread's open tables
state and ensure that we won't cause deadlock when we open tables by
ignoring flushes and name-locks.
Building of contents of I_S.TABLES no longer requires locking of tables
since we use use handler::info() method with HA_STATUS_AUTO flag instead
of handler::update_auto_increment() for obtaining information about
auto-increment values. But this also means that handlers have to implement
support for HA_STATUS_AUTO flag (particularly InnoDB needs it).
This commit is contained in:
dlenev@mysql.com
2005-08-08 17:46:06 +04:00
parent 6fd6fa517b
commit 615baa9f23
15 changed files with 160 additions and 109 deletions
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13
sql/sql_class.h
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@ -996,7 +996,13 @@ public:
ulong version;
uint current_tablenr;
Open_tables_state();
/*
This constructor serves for creation of Open_tables_state instances
which are used as backup storage.
*/
Open_tables_state() {};
Open_tables_state(ulong version_arg);
void set_open_tables_state(Open_tables_state *state)
{
@ -1203,7 +1209,6 @@ public:
List <MYSQL_ERROR> warn_list;
uint warn_count[(uint) MYSQL_ERROR::WARN_LEVEL_END];
uint total_warn_count;
List <Open_tables_state> open_state_list;
/*
Id of current query. Statement can be reused to execute several queries
query_id is global in context of the whole MySQL server.
@ -1457,8 +1462,8 @@ public:
(variables.sql_mode & MODE_STRICT_ALL_TABLES)));
}
void set_status_var_init();
bool push_open_tables_state();
void pop_open_tables_state();
void reset_n_backup_open_tables_state(Open_tables_state *backup);
void restore_backup_open_tables_state(Open_tables_state *backup);
};