Is that good or bad?
Dennis Gearon
----- Original Message ----
From: Jonathan Rochkind <rochk...@jhu.edu>
To: "solr-user@lucene.apache.org" <solr-user@lucene.apache.org>
Cc: Em <mailformailingli...@yahoo.de>
Sent: Wed, January 5, 2011 1:53:23 PM
Subject: Re: (FQ) Filter Query Caching Differences with OR and AND?
Each 'fq' clause is it's own cache key.
1. fq=foo:bar OR foo:baz
=> one entry in filter cache
2. fq=foo:bar&fq=foo:baz
=> two entries in filter cache, will not use cached entry from #1
3. fq=foo:bar
=> One entry, will use cached entry from #2
4. fq=foo:bar
=> One entry, will use cached entry from #2.
So if you do queries in succession using each of those four fq's in order, you
will wind up with 3 entries in the cache.
Note that "fq=foo:bar OR foo:baz" is not semantically identical to
"fq=foo&fq=bar". Rather that latter is semantically identical to "fq=foo:bar
AND foo:baz". But "fq=foo&fq=bar" will be two cache entries, and "fq=foo:bar
AND foo:baz" will be one cache entry, and the two won't share any cache entries.
On 1/5/2011 3:17 PM, Em wrote:
> Hi,
>
> while reading through some information on the list and in the wiki, i found
> out that something is missing:
>
> When I specify a filter queries like this
>
> fq=foo:bar OR foo:baz
> or
> fq=foo:bar&fq=foo:baz
> or
> fq=foo:bar
> or
> fq=foo:baz
>
> How many filter query entries will be cached?
> Two, since there are two filters (foo:bar, foo:baz) or 3, since there are
> three different combinations (foo:bar OR foo:baz, foo:bar, foo:baz)?
>
> Thank you!
