Re: [PATCH v3 6/9] lib: add date range query support

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+From: Tomi Ollila <tomi.ollila@iki.fi>\r
+To: Michal Nazarewicz <mina86@mina86.com>, Jani Nikula <jani@nikula.org>,\r
+       notmuch@notmuchmail.org, David Bremner <david@tethera.net>\r
+Subject: Re: [PATCH v3 6/9] lib: add date range query support\r
+In-Reply-To: <xa1tsjamdvj6.fsf@mina86.com>\r
+References: <cover.1347484177.git.jani@nikula.org>\r
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+Date: Thu, 13 Sep 2012 14:32:30 +0300\r
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+\r
+On Thu, Sep 13 2012, Michal Nazarewicz <mina86@mina86.com> wrote:\r
+\r
+> On Wed, Sep 12 2012, Jani Nikula wrote:\r
+>> Add a custom value range processor to enable date and time searches of\r
+>> the form date:since..until, where "since" and "until" are expressions\r
+>> understood by the previously added date/time parser, to restrict the\r
+>> results to messages within a particular time range (based on the Date:\r
+>> header).\r
+>>\r
+>> If "since" or "until" describes date/time at an accuracy of days or\r
+>> less, the values are rounded according to the accuracy, towards past\r
+>> for "since" and towards future for "until". For example,\r
+>> date:november..yesterday would match from the beginning of November\r
+>> until the end of yesterday. Expressions such as date:today..today\r
+>> means since the beginning of today until the end of today.\r
+>\r
+> IMO this is totally unintuitive and not how the range should work.\r
+> date:foo..bar should return messages whose date >=3D foo and < bar.  So\r
+> for instance date:november..yesterday should return messages whose date\r
+> is > 2012/11/01 00:00:00 and < 2012/09/12 00:00:00.  So to get\r
+> yesterdays messages one would do: date:yesterday..today.\r
+\r
+\r
+I find yesterday..yesterday to return whole yesterday's messages more\r
+intuitive than that returning zero messages and requiring yesterday..today\r
+to see messages sent yesterday. However, I've noticed that range\r
+described as -1day..-1day (if that syntax is/were supported)\r
+that would be a bit confusing (In yesterday's case I think the length\r
+of 'yesterday' is 24h, but in '-1day' the lenght is one second\r
+(or something))\r
+\r
+Anyway, this just emphasizes that this is confusing matter; we need\r
+a good idiom to comprehend this issue...\r
+\r
+Tomi\r
+\r
+\r
+>\r
+>> Open-ended ranges are supported (since Xapian 1.2.1), i.e. you can\r
+>> specify date:..until or date:since.. to not limit the start or end\r
+>> date, respectively.\r
+>>\r
+>> CAVEATS:\r
+>>\r
+>> Xapian does not support spaces in range expressions. You can replace\r
+>> the spaces with '_', or (in most cases) '-', or (in some cases) leave\r
+>> the spaces out altogether.\r
+>\r
+> --=20\r
+> Best regards,                                         _     _\r
+> .o. | Liege of Serenely Enlightened Majesty of      o' \,=3D./ `o\r
+> ..o | Computer Science,  Micha=C5=82 =E2=80=9Cmina86=E2=80=9D Nazarewicz =\r
+   (o o)\r
+> ooo +----<email/xmpp: mpn@google.com>--------------ooO--(_)--Ooo--_______=\r
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