[jira] [Commented] (SOLR-7219) Access filter cache from lucene query syntax

["Alessandro Benedetti (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-7219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15059830#comment-15059830 ] 

Alessandro Benedetti commented on SOLR-7219:
--------------------------------------------

I was wondering if it is really necessary to add the "filter" element in the syntax when we want to re-use the filter.

Isn't always true we would ideally re-use all our boolean clauses ?
Of course doing this automatically could produce a very fast changing filterCache.
But probably this should be completely trasparent to the user.
I got used to the concept of filter queries, but actually more the time passes more I see the opportunity in having an automatic caching for all the boolean clauses in the main query block.
What could be cons of that approach ?

> Access filter cache from lucene query syntax
> --------------------------------------------
>
>                 Key: SOLR-7219
>                 URL: https://issues.apache.org/jira/browse/SOLR-7219
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Yonik Seeley
>            Assignee: Yonik Seeley
>             Fix For: 5.4
>
>         Attachments: SOLR-7219.patch
>
>
> A filter query retrieves a set of documents matching a query from the filter cache. Since scores are not cached, all documents that match the filter produce the same score. Cached filters will be extremely fast when they are used again in another query.
> Filter Query Example:
> {code}
> description:HDTV OR filter(+promotion:tv +promotion_date:[NOW/DAY-7DAYS TO NOW/DAY+1DAY])
> {code}
> The power of the filter() syntax is that it may be used anywhere within a lucene/solr query syntax. Normal fq support is limited to top-level conjunctions. 



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