Hello.
I need to know whether a table is a SYSTEM VERSIONING table. It's needed for
MDEV-16231. And also it's needed to disable TRUNCATE TABLE for MDEV-15966: one
code path do not open table at all.
31.05.2018, 14:11, "Sergei Golubchik" <s...@mariadb.org>:
> Hi, Eugene!
>
> What are you trying to do in the first place?
>
> On May 30, Eugene Kosov wrote:
>> Hello.
>>
>> I need to see a table structure while executing some query (DELETE in my
>> case, but there will be more query types in future). I have a TABLE_LIST
>> which came from a parser. Now I'm opening it with
>> open_table_only_view_structure(), examine table structure and close it,
>> trying to prevent any side effects. And there is a lot of them.
>>
>> Current code looks like this:
>>
>> if (open_tables_only_view_structure(thd, table_list, false))
>> {
>> return true;
>> }
>>
>> // examine table structure
>>
>> close_mysql_tables(thd);
>>
>> for (Sroutine_hash_entry *e = thd->lex->sroutines_list.first;e; e=e->next)
>> e->mdl_request.ticket= NULL;
>>
>> for (TABLE_LIST *it= table_list; it; it= it->next_global)
>> {
>> it->table= NULL;
>> it->reinit_before_use(thd);
>> //it->next_global= NULL;
>> it->derived_result= NULL;
>> it->derived= NULL;
>> it->view= NULL;
>> it->view_tables= NULL;
>> it->view_sctx= NULL;
>> it->file_version= 0;
>> it->mariadb_version= 0;
>> it->updatable_view= 0;
>> it->view_suid= 0;
>> it->derived_type= 0;
>> it->open_type= OT_BASE_ONLY;
>> it->view_creation_ctx= 0;
>> // it->set_table_ref_id(TABLE_REF_NULL, 0);
>> }
>>
>> Is there a way to close a TABLE_LIST gracefully without touching a lot of
>> it's fields? Or even maybe it's possible to open a table in a simpler manner?
>>
>> --
>> Eugene
>>
>> _______________________________________________
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>
> Regards,
> Sergei
> Chief Architect MariaDB
> and secur...@mariadb.org
--
Eugene
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