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From: Callum Lamb <clamb@mintel.com>
Date: Fri, 1 Jul 2016 11:52:48 +0100
Message-ID: <CALxJQdNEudbv4G+UxNAjv79Mf_2BdZTNBLW3mVoyf+HAoOAsnA@mail.gmail.com>
Subject: Date range warming.
To: solr-user@lucene.apache.org
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archived-at: Fri, 01 Jul 2016 10:53:01 -0000

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We want to warm some FQ's. The main ones we want to do being date presets
like "last 6 months", "last year" .etc

The queries for the last 6 months get generated to look like this from site
(it's really 6 months -1 day):

*date_published:([2016-01-02T00:00:00.000Z TO 2016-07-01T23:59:59.999Z])*

But since I have to represent this is in the firstSearcher section of
solrconfig.xml I need to use the date math features (Is there another way?
There doesn't seem to be a JVM system properties with the date in it, and I
don't want to have to restart solr everyday to update a solr env variable).

So I have this:

*date_published:([NOW/DAY-6MONTH+1DAY TO NOW/DAY+1DAY-1SECOND])*

Which should resolve to the same thing. Is there someway I can check this
for sure? I get the same results when I run them.

I have a couple questions though:

1. Is Solr smart enough to see that it if the current explicit queries that
come through are the same as my date math queries and re-use the fq in this
case? Is there a way to confirm this? I can go and change them to be the
same as well, not much of an issue, more curious than anything.

2. Can Solr re-use fq's with NOW in them at all? Since NOW is changing all
the time I'm worried there some kind of checker than just sets cache=false
on all queries containing NOW or worse expands them to the current time and
caches that, and none of the fq's will ever match it (assuming solr just
does a strcmp for fq's).

Cheers,

Callum.

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