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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-2869) remove Query.getSimilarity()
Date Fri, 14 Jan 2011 15:43:45 GMT
remove Query.getSimilarity()
----------------------------

                 Key: LUCENE-2869
                 URL: https://issues.apache.org/jira/browse/LUCENE-2869
             Project: Lucene - Java
          Issue Type: Task
            Reporter: Robert Muir


Spinoff of LUCENE-2854.

See LUCENE-2828 and LUCENE-2854 for reference.

In general, the SimilarityDelegator was problematic with regards to back-compat, and if queries
want to score differently, trying to runtime subclass Similarity only causes trouble.

The reason we could not fix this in LUCENE-2854 is because:
{noformat}
Michael McCandless added a comment - 08/Jan/11 01:53 PM
bq. Is it possible to remove this method Query.getSimilarity also? I don't understand why
we need this method!

I would love to! But I think that's for another day...

I looked into this and got stuck with BoostingQuery, which rewrites to an anon 
subclass of BQ overriding its getSimilarity in turn override its coord method. 
Rather twisted... if we can do this differently I think we could remove Query.getSimilarity.
{noformat}

here is the method in question:

{noformat}
/** Expert: Returns the Similarity implementation to be used for this query.
 * Subclasses may override this method to specify their own Similarity
 * implementation, perhaps one that delegates through that of the Searcher.
 * By default the Searcher's Similarity implementation is returned.*/
public Similarity getSimilarity(IndexSearcher searcher) {
  return searcher.getSimilarity();
}
{noformat}


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