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Fixed bug mdev-3891.

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If a query referenced some system statistical tables, but not all of them,
then executing an ANALYZE command simultaneously with this query could
lead to a deadlock.
The fix prohibited reading statistics from system statistical tables
for such queries.

Removed the function unlock_tables_n_open_system_tables_for_write()
as not used anymore.
Performed some minor refactoring of the code in sql_statistics.cc.
This commit is contained in:
Igor Babaev
2012-12-12 23:16:54 -08:00
parent 109c104d07
commit 65820439bd
6 changed files with 140 additions and 107 deletions
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3
sql/sql_base.h
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@ -275,9 +275,6 @@ bool is_equal(const LEX_STRING *a, const LEX_STRING *b);
/* Functions to work with system tables. */
bool open_system_tables_for_read(THD *thd, TABLE_LIST *table_list,
Open_tables_backup *backup);
bool unlock_tables_n_open_system_tables_for_write(THD *thd,
TABLE_LIST *table_list,
Open_tables_backup *backup);
void close_system_tables(THD *thd, Open_tables_backup *backup);
void close_mysql_tables(THD *thd);
TABLE *open_system_table_for_update(THD *thd, TABLE_LIST *one_table);