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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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24
sql/sql_base.cc
View File

@ -401,8 +401,7 @@ static void mark_used_tables_as_free_for_reuse(THD *thd, TABLE *table)
upper level) and will leave prelocked mode if needed.
*/
void close_thread_tables(THD *thd, bool lock_in_use, bool skip_derived,
TABLE *stopper)
void close_thread_tables(THD *thd, bool lock_in_use, bool skip_derived)
{
bool found_old_table;
prelocked_mode_type prelocked_mode= thd->prelocked_mode;
@ -508,7 +507,7 @@ void close_thread_tables(THD *thd, bool lock_in_use, bool skip_derived,
DBUG_PRINT("info", ("thd->open_tables: %p", thd->open_tables));
found_old_table= 0;
while (thd->open_tables != stopper)
while (thd->open_tables)
found_old_table|=close_thread_table(thd, &thd->open_tables);
thd->some_tables_deleted=0;
@ -1771,6 +1770,9 @@ err:
thd - thread handler
start - list of tables in/out
counter - number of opened tables will be return using this parameter
flags - bitmap of flags to modify how the tables will be open:
MYSQL_LOCK_IGNORE_FLUSH - open table even if someone has
done a flush or namelock on it.
NOTE
Unless we are already in prelocked mode, this function will also precache
@ -1788,7 +1790,7 @@ err:
-1 - error
*/
int open_tables(THD *thd, TABLE_LIST **start, uint *counter)
int open_tables(THD *thd, TABLE_LIST **start, uint *counter, uint flags)
{
TABLE_LIST *tables;
bool refresh;
@ -1863,7 +1865,7 @@ int open_tables(THD *thd, TABLE_LIST **start, uint *counter)
}
(*counter)++;
if (!tables->table &&
!(tables->table= open_table(thd, tables, &new_frm_mem, &refresh, 0)))
!(tables->table= open_table(thd, tables, &new_frm_mem, &refresh, flags)))
{
free_root(&new_frm_mem, MYF(MY_KEEP_PREALLOC));
if (tables->view)
@ -2089,7 +2091,8 @@ int simple_open_n_lock_tables(THD *thd, TABLE_LIST *tables)
{
DBUG_ENTER("simple_open_n_lock_tables");
uint counter;
if (open_tables(thd, &tables, &counter) || lock_tables(thd, tables, counter))
if (open_tables(thd, &tables, &counter, 0) ||
lock_tables(thd, tables, counter))
DBUG_RETURN(-1); /* purecov: inspected */
DBUG_RETURN(0);
}
@ -2116,7 +2119,7 @@ bool open_and_lock_tables(THD *thd, TABLE_LIST *tables)
{
uint counter;
DBUG_ENTER("open_and_lock_tables");
if (open_tables(thd, &tables, &counter) ||
if (open_tables(thd, &tables, &counter, 0) ||
lock_tables(thd, tables, counter) ||
mysql_handle_derived(thd->lex, &mysql_derived_prepare) ||
(thd->fill_derived_tables() &&
@ -2133,6 +2136,9 @@ bool open_and_lock_tables(THD *thd, TABLE_LIST *tables)
open_normal_and_derived_tables
thd - thread handler
tables - list of tables for open
flags - bitmap of flags to modify how the tables will be open:
MYSQL_LOCK_IGNORE_FLUSH - open table even if someone has
done a flush or namelock on it.
RETURN
FALSE - ok
@ -2143,12 +2149,12 @@ bool open_and_lock_tables(THD *thd, TABLE_LIST *tables)
data from the tables.
*/
bool open_normal_and_derived_tables(THD *thd, TABLE_LIST *tables)
bool open_normal_and_derived_tables(THD *thd, TABLE_LIST *tables, uint flags)
{
uint counter;
DBUG_ENTER("open_normal_and_derived_tables");
DBUG_ASSERT(!thd->fill_derived_tables());
if (open_tables(thd, &tables, &counter) ||
if (open_tables(thd, &tables, &counter, flags) ||
mysql_handle_derived(thd->lex, &mysql_derived_prepare))
DBUG_RETURN(TRUE); /* purecov: inspected */
DBUG_RETURN(0);