Hi, Michael! On Sep 08, Michael Widenius wrote: > revision-id: c3ecf0d6243 (mariadb-10.5.2-269-gc3ecf0d6243) > parent(s): c79c6f78205 > author: Michael Widenius <[email protected]> > committer: Michael Widenius <[email protected]> > timestamp: 2020-09-02 20:58:33 +0300 > message: > > Optimize size of lex structures > > LEX, st_select_lex, st_select_unit optimized for space: > - Use bit fields for bool variables > - Ensure that all bit fields are initialized (improves > performance for init functions as all bit fields can be > initalized with one memory access) > - Move members around in above structures to remove alignment > gaps > > diff --git a/sql/sql_lex.h b/sql/sql_lex.h > index f516219c01a..1f6e50d8b60 100644 > --- a/sql/sql_lex.h > +++ b/sql/sql_lex.h > @@ -725,12 +725,15 @@ class st_select_lex_node { > st_select_lex_node *next, **prev, /* neighbor list */ > *master, *slave, /* vertical links */ > *link_next, **link_prev; /* list of whole SELECT_LEX */ > + enum sub_select_type linkage; > > void init_query_common(); > -public: > > +public: > ulonglong options; > - > + uint8 uncacheable; > + bool distinct:1; > + bool no_table_names_allowed:1; /* used for global order by */
I thought you didn't like this approach and preferred flags & DISTINCT instead. Either you forgot to change LEX to flags or you forgot to squash your commits. > /* > result of this query can't be cached, bit field, can be : Regards, Sergei VP of MariaDB Server Engineering and [email protected] _______________________________________________ Mailing list: https://launchpad.net/~maria-developers Post to : [email protected] Unsubscribe : https://launchpad.net/~maria-developers More help : https://help.launchpad.net/ListHelp
