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MDEV-10424 - Assertion `ticket == __null' failed in MDL_request::set_type

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Reexecution of prepared "ANALYZE TABLE merge_table, table" may miss to
reinitialize "table" for subsequent execution and trigger assertion failure.

This happens because MERGE engine may adjust table->next_global chain, which
gets cleared by close_thread_tables()/ha_myisammrg::detach_children() later.
Since reinitilization iterates next_global chain, it won't see tables following
merge table.

Fixed by appending saved next_global chain after merge children.
This commit is contained in:
Sergey Vojtovich
2016-08-04 15:43:52 +04:00
parent 09cb64682b
commit 723488bba1
3 changed files with 43 additions and 1 deletions
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14
sql/sql_admin.cc
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@ -441,7 +441,19 @@ static bool mysql_admin_table(THD* thd, TABLE_LIST* tables,
}
thd->prepare_derived_at_open= FALSE;
table->next_global= save_next_global;
/*
MERGE engine may adjust table->next_global chain, thus we have to
append save_next_global after merge children.
*/
if (save_next_global)
{
TABLE_LIST *table_list_iterator= table;
while (table_list_iterator->next_global)
table_list_iterator= table_list_iterator->next_global;
table_list_iterator->next_global= save_next_global;
save_next_global->prev_global= &table_list_iterator->next_global;
}
table->next_local= save_next_local;
thd->open_options&= ~extra_open_options;