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https://issues.apache.org/jira/browse/SOLR-2026?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12896011#action_12896011
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Karl Wright commented on SOLR-2026:
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bq. Maybe I miss something but what keeps you from running two queries in a
single QueryComponent?
You can, so long as you kick off both queries with a SearchComponent's
process() method. Problem is, this basically bypasses most of Solr, including
distribute queries, the SearchComponent pipeline, etc.
The purpose of this change was to add a well-defined infrastructure to allow
people to do multiple queries in a Solr friendly way.
> Need infrastructure support in Solr for requests that perform multiple
> sequential queries
> -----------------------------------------------------------------------------------------
>
> Key: SOLR-2026
> URL: https://issues.apache.org/jira/browse/SOLR-2026
> Project: Solr
> Issue Type: Improvement
> Components: SearchComponents - other
> Reporter: Karl Wright
> Assignee: Simon Willnauer
> Attachments: SOLR-2026.patch, SOLR-2026.patch
>
>
> Several known cases exist where multiple index searches need to be performed
> in order to arrive at the final result. Typically, these have the constraint
> that the results from one search query are required in order to form a
> subsequent search query. While it is possible to write a custom
> QueryComponent or search handler to perform this task, an extension to the
> SearchHandler base class would readily permit such query sequences to be
> configured using solrconfig.xml.
> I will be therefore writing and attaching a patch tomorrow morning which
> supports this extended functionality in a backwards-compatible manner. The
> tricky part, which is figuring out how to funnel the output of the previous
> search result into the next query, can be readily achieved by use of the
> SolrRequestObject.getContext() functionality. The stipulation will therefore
> be that the SolrRequestObject's lifetime will be that of the entire request,
> which makes complete sense. (The SolrResponseObject's lifetime will, on the
> other hand, be limited to a single query, and the last response so formed
> will be what gets actually returned by SearchHandler.)
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