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+Date: Wed, 29 Jan 2014 15:46:09 -0500\r
+From: Austin Clements <aclements@csail.mit.edu>\r
+To: Carl Worth <cworth@cworth.org>\r
+Subject: Re: [PATCH 0/5] lib: make folder: prefix literal\r
+Message-ID: <20140129204608.GE4375@mit.edu>\r
+References: <cover.1389304779.git.jani@nikula.org>\r
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+\r
+Quoth Carl Worth on Jan 29 at 11:32 am:\r
+> Jani Nikula <jani@nikula.org> writes:\r
+> > Unfortunately, I haven't had the time to experiment with this. But it\r
+> > bugs me that the probabilistic folder: prefix has stemming and it's case\r
+> > insensitive. It's possible to work around the stemming with the anchors\r
+> > you suggest or by quoting, but is there a way to have case sensitive\r
+> > probabilistic prefixes?\r
+> \r
+> The stemming and case insensitivity just has to do with which terms are\r
+> shoved into the database, (you have to add extra terms to get these\r
+> features). If we're getting those features for folder now, (and I agree\r
+> that we don't want them), it's because we're calling some Xapian\r
+> convenience function along the lines of "create a bunch of terms for\r
+> this chunk of text".\r
+> \r
+> The fix for that is to do the simple thing and simply break the path at\r
+> each '/' and add a term for each component. Then these problems all go\r
+> away.\r
+\r
+I think you're assuming we have much more control over this than we\r
+do. It's true that we're using Xapian::TermGenerator for this, which\r
+is what strips case and stems terms (and removes any punctuation like\r
+$ or ^), but Xapian's current query parser only gives us two options\r
+for a prefix: either don't parse them at all (boolean terms), or parse\r
+them using TermGenerator (probabilistic terms). We can index these\r
+terms however we want, but there's simply no hook into the query\r
+parser that would let us split the query at each '/' at search time.\r
+\r
+> So fixes for this should not require switching from a probabilistic to a\r
+> Boolean prefix.\r
projects / notmuch-archives.git / commitdiff