RelaxQueryComponent - A new SearchComponent that relaxes the main in a 
semiautomatic way

                 Key: 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:

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

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:

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


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

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 

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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