Need infrastructure support in Solr for requests that perform multiple
sequential queries
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Key: SOLR-2026
URL: https://issues.apache.org/jira/browse/SOLR-2026
Project: Solr
Issue Type: Improvement
Components: SearchComponents - other
Reporter: Karl Wright
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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