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MDEV-4955 discover of table non-existance on CREATE

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when frm file exists, but the table does not.

In recover_from_failed_open(), allow the discovery
to fail without an error, when
open_strategy == TABLE_LIST::OPEN_IF_EXISTS.
This commit is contained in:
Sergei Golubchik
2013-11-28 16:39:17 +01:00
parent 1387e71531
commit 38c91c067b
3 changed files with 35 additions and 9 deletions
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28
sql/sql_base.cc
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@ -2269,12 +2269,12 @@ bool open_table(THD *thd, TABLE_LIST *table_list, MEM_ROOT *mem_root,
{
if (!ha_table_exists(thd, table_list->db, table_list->table_name))
DBUG_RETURN(FALSE);
/* Table exists. Let us try to open it. */
}
else if (table_list->open_strategy == TABLE_LIST::OPEN_STUB)
DBUG_RETURN(FALSE);
/* Table exists. Let us try to open it. */
if (table_list->i_s_requested_object & OPEN_TABLE_ONLY)
gts_flags= GTS_TABLE;
else if (table_list->i_s_requested_object & OPEN_VIEW_ONLY)
@ -3290,6 +3290,7 @@ request_backoff_action(enum_open_table_action action_arg,
table->table_name,
table->table_name_length,
table->alias, TL_WRITE);
m_failed_table->open_strategy= table->open_strategy;
m_failed_table->mdl_request.set_type(MDL_EXCLUSIVE);
}
m_action= action_arg;
@ -3310,8 +3311,7 @@ request_backoff_action(enum_open_table_action action_arg,
*/
bool
Open_table_context::
recover_from_failed_open(THD *thd)
Open_table_context::recover_from_failed_open(THD *thd)
{
bool result= FALSE;
/* Execute the action. */
@ -3333,11 +3333,21 @@ recover_from_failed_open(THD *thd)
thd->get_stmt_da()->clear_warning_info(thd->query_id);
thd->clear_error(); // Clear error message
if ((result=
!tdc_acquire_share(thd, m_failed_table->db,
m_failed_table->table_name,
GTS_TABLE | GTS_FORCE_DISCOVERY | GTS_NOLOCK)))
break;
No_such_table_error_handler no_such_table_handler;
bool open_if_exists= m_failed_table->open_strategy == TABLE_LIST::OPEN_IF_EXISTS;
if (open_if_exists)
thd->push_internal_handler(&no_such_table_handler);
result= !tdc_acquire_share(thd, m_failed_table->db,
m_failed_table->table_name,
GTS_TABLE | GTS_FORCE_DISCOVERY | GTS_NOLOCK);
if (open_if_exists)
{
thd->pop_internal_handler();
if (result && no_such_table_handler.safely_trapped_errors())
result= FALSE;
}
thd->mdl_context.release_transactional_locks();
break;