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From Mark Miller <markrmil...@gmail.com>
Subject Re: Where to place ReversedWildcardFilterFactory in Chain
Date Thu, 01 Oct 2009 14:05:16 GMT
Chantal Ackermann wrote:
> Hi all,
>
> I would have two questions about the ReversedWildcardFilterFactory:
> a) put it into both chains, index and query, or into index only?
> b) where exactly in the/each chain do I have to put it? (Do I have to
> respect a certain order - as I have wordDelimiter and lowercase in
> there, as well.)
>
> More Details:
>
> I understand it is used to allow queries like "*sport".
>
> My current configuration for the field I want to use it for contains
> this setup:
>
> <fieldType name="text_cn" class="solr.TextField">
>   <analyzer>
>     <filter class="solr.WordDelimiterFilterFactory"
>        splitOnCaseChange="1" splitOnNumerics="1"
>        stemEnglishPossessive="1" generateWordParts="1"
>        generateNumberParts="1" catenateAll="1"
>        preserveOriginal="1" />
>     <filter class="solr.LowerCaseFilterFactory" />
>   </analyzer>
> </fieldType>
>
> The wiki page
> http://wiki.apache.org/solr/AnalyzersTokenizersTokenFilters states for
> the ReversedWildcardFF:
> "Add this filter to the index analyzer, but not the query analyzer."
>
> However, the API for it says it provides functionality at index and
> query time (my understanding):
> "When this factory is added to an analysis chain, it will be used both
> for filtering the tokens during indexing, and to determine the query
> processing of this field during search."
>
> Any help is greatly appreciated.
> Thanks!
> Chantal
>
>
>
You just put it in the index chain, not the query chain. The
SolrQueryParser will consult it when building a wildcard search - don't
put it in the query chain. I know, appears like a bit of magic. That
Andrzej is a wizard though, so it makes sense ;)

-- 
- Mark

http://www.lucidimagination.com




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