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https://issues.apache.org/jira/browse/SOLR-2026?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13002701#comment-13002701
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Peter Sturge commented on SOLR-2026:
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Hi Karl,
This patch is a really good idea - many thanks for coming up with this!
I've tried applying this on trunk, but I get a few compile errors from the
patch, and I'm not quite sure how to use it in a query.
The compile errors have to do with:
SearchHandler.java (~line 267):
ResponseBuilder rb = new ResponseBuilder();
ResponseBuilder doesn't have a no-arg ctor
ResponseBuilder.java (~line 141): (copyFrom())
debug = rb.debug;
There is no 'debug' parameter.
I've fixed these up locally, but as I've only just looked at this, I thought
I'd run it by you before patching it up.
There's also an NPE thrown if debugQuery=true (@DebugComponent.java:56)
I haven't been able to build a query that seems to work..
Do you have any example query urls you use for testing?
http://127.0.0.1:9000/solr/select?qt=multiquery&blah&blah etc...
Many thanks!
Peter
> 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
> 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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