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From Ian Lea <ian....@gmail.com>
Subject Re: DisjunctionMaxQuery and custom Sort
Date Fri, 05 Mar 2010 09:42:23 GMT
>From the javadocs for the search with sort method it appears you are calling:

NOTE: this does not compute scores by default; use
IndexSearcher.setDefaultFieldSortScoring(boolean, boolean) to enable
scoring.


Sounds like you need to call that with at least the first arg set to true.


--
Ian.


On Fri, Mar 5, 2010 at 9:13 AM, gabriele renzi <rff.rff@gmail.com> wrote:
> Hi everyone,
>
> In our search app we'd perform searches with a DisjunctionMaxQuery
> with code like
>
>  searcher.search(query, hits)
>
> Now we'd like to add a custom sub-sort so that when the search returns
> two documents with the same score they will be ordered by a custom
> field (this is not a boost for two reasons: first,  we already use
> boosting for other goals, second, we may like to add a third level of
> boosting in the future)
>
> I thought I could just change the former line to something like
>
>  searcher.search(query, null, hits, new Sort(SortField.SCORE_FIELD,
> new CustomSortField())
>
> but I had unexpected results, so I dropped our custom SortField, and
> tried the simple
>
>  searcher.search(query, null, hits, new Sort(SortField.SCORE_FIELD))
>
> which I though should have the same behaviour of our original code:
> yet, a large part of our tests failed because it appears that the
> results are not the same as above.
>
> So my question is threefold:
> 1. is the last query really not functionally equivalent to the first?
> 2. if not, how would the equivalent be?
> 3. and how can I perform a sub-sorting of the results by relevance
> first and my custom score field later?
>
> FWIW I am using lucene 2.9.1, java 1.6, OSX 10.6. Thanks in advance
> for any help.
>
> --
> blog en: http://www.riffraff.info
> blog it: http://riffraff.blogsome.com
>
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