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From "Koji Sekiguchi (JIRA)" <j...@apache.org>
Subject [jira] Created: (SOLR-1878) RelaxQueryComponent - A new SearchComponent that relaxes the main in a semiautomatic way
Date Mon, 12 Apr 2010 01:37:41 GMT
RelaxQueryComponent - A new SearchComponent that relaxes the main in a semiautomatic way
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                 Key: SOLR-1878
                 URL: https://issues.apache.org/jira/browse/SOLR-1878
             Project: Solr
          Issue Type: New Feature
          Components: SearchComponents - other
    Affects Versions: 1.4
            Reporter: Koji Sekiguchi
            Priority: Minor


I have the following use case:

Imagine that you visit a web page for searching an apartment for rent. You choose parameters,
usually mark check boxes and this makes AND queries:

{code}
rent:[* TO 1500] AND bedroom:[2 TO *] AND floor:[100 TO *]
{code}

If the conditions are too tight, Solr may return few or zero leasehold properties. Because
the things is not good for the site visitors and also owners, the owner may want to recommend
the visitors to relax the conditions something like:

{code}
rent:[* TO 1700] AND bedroom:[2 TO *] AND floor:[100 TO *]
{code}

or:

{code}
rent:[* TO 1500] AND bedroom:[2 TO *] AND floor:[90 TO *]
{code}

And if the relaxed query get more numFound than original, the web page can provide a link
with a comment "if you can pay additional $100, ${numFound} properties will be found!".

Today, I need to implement client for this scenario, but this way makes two round trips for
showing one page and consistency problem (and laborious of course!).

I'm thinking a new SearchComponent that can be used with QueryComponent. It does search when
numFound of the main query is less than a threshold. Clients can specify via request parameters
how the query can be relaxed.

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