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+ id 1RnEzz-00082h-Kv; Tue, 17 Jan 2012 14:47:15 -0500\r
+Date: Tue, 17 Jan 2012 14:47:15 -0500\r
+From: Austin Clements <amdragon@MIT.EDU>\r
+To: Jani Nikula <jani@nikula.org>\r
+Subject: Re: Partial words on notmuch search?\r
+Message-ID: <20120117194715.GO16740@mit.edu>\r
+References: <20120115220600.GO7037@think.nuvreauspam>\r
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+Cc: notmuch@notmuchmail.org, Andrei Popescu <andreimpopescu@gmail.com>\r
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+\r
+Quoth Jani Nikula on Jan 17 at 7:43 pm:\r
+> On Mon, 16 Jan 2012 21:34:31 -0500, Austin Clements <amdragon@MIT.EDU> wrote:\r
+> > Quoth Andrei Popescu on Jan 16 at 10:21 pm:\r
+> > > This is also interesting:\r
+> > > $ notmuch count 'debian'\r
+> > > 65888\r
+> > > $ notmuch count 'dEbian'\r
+> > > 65888\r
+> > > $ notmuch count 'Debian'\r
+> > > 65887\r
+> > \r
+> > The first two will match stemmed versions of "debian" such as\r
+> > "debian's" and "debianed". However, starting a term with a capital\r
+> > letter suppresses stemming (because it suggests that it's a name,\r
+> > which you wouldn't want to modify), so your last query matches only\r
+> > the term "debian". This is probably documented somewhere, though I\r
+> > don't know where.\r
+> \r
+> Interesting. Is this done when adding the terms to the database, or when\r
+> searching? I presume the latter. How much control does notmuch have over\r
+> this?\r
+\r
+This is getting a bit out of my depth, but I believe indexing is done\r
+with both stemmed and unstemmed versions of all terms (if stemming is\r
+enabled) so that search can use either.\r
+\r
+For indexing, Notmuch can set the stemmer (or no stemmer). Xapian\r
+provides stemmers for a variety of languages:\r
+ http://xapian.org/docs/apidoc/html/classXapian_1_1Stem.html#6c46cedf2047b159a7e4c9d4468242b1\r
+\r
+For query parsing, Notmuch can set both the stemmer and a "stemming\r
+strategy" that controls when it stems or doesn't stem terms:\r
+ http://xapian.org/docs/apidoc/html/classXapian_1_1QueryParser.html#c7dc3b55b6083bd3ff98fc8b2726c8fd\r
projects / notmuch-archives.git / commitdiff