Re: [PATCH] WIP: regexp matching in 'subject' and 'from'

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+ Fri, 10 Jun 2016 11:09:36 -0000\r
+From: David Bremner <david@tethera.net>\r
+To: Gaute Hope <eg@gaute.vetsj.com>, Austin Clements <aclements@csail.mit.edu>\r
+Cc: sfischme@uwaterloo.ca, notmuch <notmuch@notmuchmail.org>\r
+Subject: Re: [PATCH] WIP: regexp matching in 'subject' and 'from'\r
+In-Reply-To: <1465547660-astroid-0-nudmv20lbk-1296@strange>\r
+References: <1465265149-7174-1-git-send-email-david@tethera.net>\r
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+Date: Fri, 10 Jun 2016 08:09:36 -0300\r
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+Gaute Hope <eg@gaute.vetsj.com> writes:\r
+\r
+>\r
+> Cool!\r
+>\r
+> Would it break a lot of things if you just replace the original prefix?\r
+\r
+It would change the matching behaviour. I guess there are people that\r
+like the current "sloppy" matching of from: and subject:.  In my\r
+not-very-scientific tests, it is a factor of 5 to 10 times slower to do\r
+regexp search, which makes sense because it is effectively post\r
+processing the results from Xapian. At least on my system it seems fast\r
+enough to be usable interactively, but that is a pretty shocking\r
+performance regression. And I know there are people with more mail on\r
+slower systems.\r
+\r
+> Could it be made to work on the message body?\r
+\r
+See Austin's previous reply for the details, but basically no; these\r
+"values" index in terms of whole strings, while the body is indexed by\r
+terms (roughly, words). In principle we could add a value slot for the\r
+body, but I think that would at least double the size of the database\r
+(maybe more).\r