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From <karl.wri...@nokia.com>
Subject RE: [jira] Commented: (SOLR-2026) Need infrastructure support in Solr for requests that perform multiple sequential queries
Date Fri, 04 Mar 2011 18:28:59 GMT
All that the patch contributes is the infrastructure needed to allow multiple queries.  It's
structured so that the results from one query are available to construct the query for the
next.  The patch does not contribute a multi-query query parser, or means of merging the results
into a final result.

Karl

From: ext Peter Sturge [mailto:peter.sturge@gmail.com]
Sent: Friday, March 04, 2011 1:04 PM
To: dev@lucene.apache.org
Subject: Re: [jira] Commented: (SOLR-2026) Need infrastructure support in Solr for requests
that perform multiple sequential queries

Hi Karl,

Yes, from looking at the conflicts, it looked like trunk changes were causing the errors -
but won't be too difficult to fix these.

I've got the patch (+tweaks) installed and working, and basic (i.e. non qt=multiquery) searches
are working fine.
What I can't figure out is how to enter in sequential queries from a browser client (i.e.
'query1', 'query2' etc.).
Yep, understand you can't include proprietary code - but can you show the query syntax that
will shove a couple of sequential queries into the requestHandler?
Or am I misunderstanding the patch and there's server-side code to write?

Thanks,
Peter


On Fri, Mar 4, 2011 at 5:11 PM, Karl Wright (JIRA) <jira@apache.org<mailto:jira@apache.org>>
wrote:

   [ https://issues.apache.org/jira/browse/SOLR-2026?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13002719#comment-13002719
]

Karl Wright commented on SOLR-2026:
-----------------------------------

Lots of stuff has changed in trunk since the patch was posted.  I think you'd have to debug
it all over again, and attach a new patch, to bring it up to date.

Since this basically should work the same for a single query as does the current trunk, the
first round of testing is just making sure everything still works as before.  If you then
change solrconfig.xml to specify multiple query processing chains, then obviously you need
code that can work with that.  I tested it with proprietary Nokia code, so I can't exactly
include that. ;-)


> 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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