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+Date: Tue, 31 Jan 2012 11:25:06 -0500\r
+From: Austin Clements <amdragon@MIT.EDU>\r
+To: Mark Walters <markwalters1009@gmail.com>\r
+Subject: Re: [PATCH 3/7] lib: Make notmuch_query_search_messages set the\r
+ exclude flag\r
+Message-ID: <20120131162506.GE10898@mit.edu>\r
+References: <8762fu4aqt.fsf@qmul.ac.uk>\r
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+\r
+Quoth Mark Walters on Jan 31 at 11:45 am:\r
+> On Mon, 30 Jan 2012 23:43:52 -0500, Austin Clements <amdragon@MIT.EDU> wrote:\r
+> > Quoth Mark Walters on Jan 29 at 6:39 pm:\r
+> > > notmuch_message_node_t *iterator;\r
+> > > };\r
+> > > \r
+> > > diff --git a/lib/notmuch.h b/lib/notmuch.h\r
+> > > index 7929fe7..740d005 100644\r
+> > > --- a/lib/notmuch.h\r
+> > > +++ b/lib/notmuch.h\r
+> > > @@ -449,6 +449,11 @@ typedef enum {\r
+> > > const char *\r
+> > > notmuch_query_get_query_string (notmuch_query_t *query);\r
+> > > \r
+> > > +/* specify whether to results should omit the excluded results rather\r
+> > > + * than just marking them excluded */\r
+> > > +void\r
+> > > +notmuch_query_set_omit_excluded_messages (notmuch_query_t *query, notmuch_bool_t omit);\r
+> > > +\r
+> > \r
+> > I don't think we should add this API. The library behavior will not\r
+> > change for library users that don't use excludes and library users\r
+> > that do use excludes should by aware of the excluded flag and do the\r
+> > appropriate thing.\r
+> > \r
+> > I can see why this is handy in some cases, but I don't think it\r
+> > provides enough utility to warrant becoming part of the permanent and\r
+> > minimal library interface.\r
+> \r
+> This is really a performance improvement: suppose that there are lots of\r
+> threads that only match in excluded messages. Then without this flag we\r
+> will spend lots of time constructing the thread only for it to be\r
+> ignored. (In contrived situations this could be arbitrarily slower.)\r
+\r
+I would prefer to keep the public API minimal and only introduce\r
+something like this if people actually experience performance\r
+problems.\r