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POAny way to merge two queries in solr?
 

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  1. POAny way to merge two queries in solr?
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    <p>In my project, we use solr to index a lot of different kind of documents, by example Books and Persons, with some common fields (like the name) and some type-specific fields (like the category, or the group people belong to).</p> <p>We would like to do queries that can find both books and persons, with for each document type some filters applied. Something like:</p> <ul> <li>find all Books and Persons with "Jean" in the name and/or content</li> <li>but only Books from category "fiction" and "fantasy"</li> <li>and only Persons from the group "pangolin"</li> <li>everything sorted by score</li> </ul> <p>A very simple way to do that would be:</p> <pre><code>q = name:jean content:jean &amp; fq= (type:book AND category:(fiction fantasy)) OR (type:person AND group:pangolin) </code></pre> <p>But alas, as <code>fq</code> are cached, I'd prefer something allowing me simpler and so more reusable <code>fq</code> like :</p> <ul> <li><code>fq=type:book</code>,</li> <li><code>fq=type:person</code>, </li> <li><code>fq=category(fiction fantasy)</code>,</li> <li><code>fq=group:pangolin</code>.</li> </ul> <p>Is there a way to tell solr to merge or combine many queries? Something like 'grouping' <code>fq</code> together.</p> <p>I read a bit about nested queries with <code>_query_</code>, but the very few documentation about it makes me think it's not the solution I'm looking for.</p>
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    1. COI'm pretty sure this is not possible. Each filter query (fq) is calculated independently and results in a cached docset (unordered set of docids). Fq's are useful (read fast) because when specifying a couple of them the docsets get interesected which quickly truncates the searchspace. In other words: specifying multiple filter queries logically results in AND'ing them
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      1. USGeert-Jan
    2. COIt's a shame that Solr Fieldcollapsing http://wiki.apache.org/solr/FieldCollapsing doesn't support appending fq's AFTER you specified the field to group on (in your case 'type') that would have pretty much solved it. Still I hope that link might prove useful, as it's a good way to represent N top-documents per type. Although I realize that's not 100% what you're asking here..
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      1. USGeert-Jan
    3. COI was pretty sure too this is not possible, but I was hoping something I missed :) It would be a really cool thing to set groups of fq in a query, something like `fq={group:A}...&fq={group:A}...&fq={group:B}`, so solr will play the query, then filter with something like "all fq from group A OR all fq from group B" instead of its simple "all fq". Well, I guess I have to use the non-present-field condition solution I describe in my comment in @Paige Cook answer. Thanks anyway for the answer!
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