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https://issues.apache.org/jira/browse/SOLR-2026?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12903791#action_12903791
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Lance Norskog commented on SOLR-2026:
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In fact, I have a use case that needs no custom code: "There are more results
from this site" like Google Search. No counts, just a binary value.
The easy way to do this is to pull the collapsar field from successive docs
until you end up with 10 unique documents, and 10 boolean values. No custom
code required. This should be a custom RequestHandler/SearchHandler/whatever
is the right thing.
This would have to be above the distributed broker.
> 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: New Feature
> Components: SearchComponents - other
> Reporter: Karl Wright
> Assignee: Simon Willnauer
> Priority: Minor
> Fix For: 4.0
>
> 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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