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Give warnings if open_stat_table_for_ddl() fails

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The warning is given in case of table not found or if there is a lock
timeout. The warning is needed as in case of a lock timeout then the
persistent table stats are going to be wrong.
This commit is contained in:
Monty
2023-09-24 14:40:29 +03:00
parent 684f7f81a0
commit 4c8d2410b6
4 changed files with 21 additions and 4 deletions
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3
mysql-test/main/stat_tables_missing.result
View File

@ -2,6 +2,9 @@ create table t1 (a int);
alter table mysql.column_stats rename to mysql.column_stats1;
flush tables;
alter table t1 change a b varchar(100);
Warnings:
Warning 1177 Got error 1146 when trying to open statistics table `table_stats` for updating statistics
Warning 1177 Got error 1146 when trying to open statistics table `table_stats` for updating statistics
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (

3
sql/sql_base.cc
View File

@ -73,6 +73,8 @@ No_such_table_error_handler::handle_condition(THD *,
Sql_condition ** cond_hdl)
{
*cond_hdl= NULL;
if (!first_error)
first_error= sql_errno;
if (sql_errno == ER_NO_SUCH_TABLE || sql_errno == ER_NO_SUCH_TABLE_IN_ENGINE)
{
m_handled_errors++;
@ -95,7 +97,6 @@ bool No_such_table_error_handler::safely_trapped_errors()
return ((m_handled_errors > 0) && (m_unhandled_errors == 0));
}
/**
This internal handler is used to trap ER_NO_SUCH_TABLE and
ER_WRONG_MRG_TABLE errors during CHECK/REPAIR TABLE for MERGE

7
sql/sql_base.h
View File

@ -643,7 +643,7 @@ class No_such_table_error_handler : public Internal_error_handler
{
public:
No_such_table_error_handler()
: m_handled_errors(0), m_unhandled_errors(0)
: m_handled_errors(0), m_unhandled_errors(0), first_error(0)
{}
bool handle_condition(THD *thd,
@ -658,11 +658,12 @@ public:
trapped and no other errors have been seen. FALSE otherwise.
*/
bool safely_trapped_errors();
bool any_error() { return m_handled_errors == 0 || m_unhandled_errors == 0; }
uint got_error() { return first_error; }
private:
int m_handled_errors;
int m_unhandled_errors;
uint first_error;
};
#endif /* SQL_BASE_INCLUDED */

12
sql/sql_statistics.cc
View File

@ -284,6 +284,10 @@ static int open_stat_tables(THD *thd, TABLE_LIST *tables, bool for_write)
@details
This is used by DDLs. When a column or index is dropped or renamed,
stat tables need to be adjusted accordingly.
This function should not generate any errors as the callers are not checking
the result of delete_statistics_for_table()
*/
static inline int open_stat_table_for_ddl(THD *thd, TABLE_LIST *table,
const LEX_CSTRING *stat_tab_name)
@ -293,6 +297,14 @@ static inline int open_stat_table_for_ddl(THD *thd, TABLE_LIST *table,
thd->push_internal_handler(&nst_handler);
int res= open_system_tables_for_read(thd, table);
thd->pop_internal_handler();
if (res && nst_handler.any_error())
{
push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN,
ER_CHECK_NO_SUCH_TABLE,
"Got error %d when trying to open statistics "
"table %`s for updating statistics",
nst_handler.got_error(), stat_table_name->str);
}
return res;
}