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["nanyi607rao" <nanyi607rao@xxxxxxxxx>]

very clear ! thank you

> Hm, the way it is supposed to work is this: 

> A DDL like CREATE TABLE is logged as two events: 

> 1. A GTID_EVENT with the FL_STANDALONE flag set 
> 2. A QUERY_EVENT with the CREATE TABLE statement 

> (no end event, as you wrote. The FL_STANDALONE flag in the GTID_EVENT is used 
> to handle the case where there is a GTID event but no end event). 

> In handle_rpl_parallel_thread(), group_standalone will be true because the 
> FL_STANDALONE flag is set. Then end_of_group will also be true, because of 
> this condition: 

>     (group_standalone && !Log_event::is_part_of_group(event_type)) 

> (is_part_of_group() is false for a QUERY_EVENT). 

> Then the code will call into finish_event_group() which calls 
> rgi->mark_start_commit_no_lock(), which does 
> ++e->count_committing_event_groups. 

> So as far as I can see, things should work correctly also for DDL. Does this 
> make things clearer for you? Or is there some problem with the code that I 
> missed in the above explanation?