Hello Jon Olav!
* Jon Olav Hauglid <jon.hauglid@stripped> [10/11/15 21:23]:
> #At file:///export/home/x/mysql-5.5-runtime-prereq/ based on
> 3185 Jon Olav Hauglid 2010-11-15
> Bug #57663 Concurrent statement using stored function and DROP DATABASE
> breaks SBR
> This pre-requisite patch refactors the code for dropping tables, used
> by DROP TABLE and DROP DATABASE. The patch moves the code for acquiring
> metadata locks out of mysql_rm_table_part2() and makes it the
> responsibility of the caller. This in preparation of changing the
> DROP DATABASE implementation to acquire all metadata locks before any
> changes are made. mysql_rm_table_part2() is renamed
> mysql_rm_table_no_locks() to reflect the change.
> === modified file 'sql/sql_table.cc'
> --- a/sql/sql_table.cc 2010-11-12 11:23:17 +0000
> +++ b/sql/sql_table.cc 2010-11-15 18:13:30 +0000
> + Execute the drop of a normal or temporary table.
> + @param thd Thread handler
> + @param tables Tables to drop
> + @param if_exists If set, don't give an error if table doesn't exists.
> + In this case we give an warning of level 'NOTE'
> + @param drop_temporary Only drop temporary tables
> + @param drop_view Allow to delete VIEW .frm
> + @param dont_log_query Don't write query to log files. This will also not
> + generate warnings if the handler files doesn't exists
> + @retval 0 ok
> + @retval 1 Error
> + @retval -1 Thread was killed
> + @note This function assumes that metadata locks have already been taken.
As discussed on IRC I think it also makes sense to mention that
this function assumes that the tables have been removed from TDC.
I am OK with your patch and think that it can be pushed after
considering/addressing the above suggestion.
Dmitry Lenev, Software Developer
Oracle Development SPB/MySQL, www.mysql.com
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