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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3130) Use BoostAttribute in in TokenFilters to denote Terms that QueryParser should give lower boosts
Date Sat, 21 May 2011 13:23:47 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13037387#comment-13037387
] 

Robert Muir commented on LUCENE-3130:
-------------------------------------

{quote}
Furthermore: if we add a new BoostAttrToPayloadAttrFilter that just copied the boost attribute
into the payload attribute, these same filters could give "penalizing" payloads to terms when
used at index time) could give "penalizing" payloads to terms.
{quote}

Again, I think this is at the wrong level. If you do what you describe, what if you then want
to tweak the ranking for synonyms? You must reindex.

Instead, its far better to use TypeAsPayloadFilter and put the type into the payload. Then
you can tweak scorePayload() to your hearts content to adjust the ranking without reindexing
all documents.


> Use BoostAttribute in in TokenFilters to denote Terms that QueryParser should give lower
boosts
> -----------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-3130
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3130
>             Project: Lucene - Java
>          Issue Type: Improvement
>            Reporter: Hoss Man
>
> A recent thread asked if there was anyway to use QueryTime synonyms such that matches
on the original term specified by the user would score higher then matches on the synonym.
 It occurred to me later that a float Attribute could be set by the SynonymFilter in such
situations, and QueryParser could use that float as a boost in the resulting Query.  IThis
would be fairly straightforward for the simple "synonyms => BooleamQuery" case, but we'd
have to decide how to handle the case of synonyms with multiple terms that produce MTPQ, possibly
just punt for now)
> Likewise, there may be other TokenFilters that "inject" artificial tokens at query time
where it also might make sense to have a reduced "boost" factor...
> * SynonymFilter
> * CommonGramsFilter
> * WordDelimiterFilter
> * etc...
> In all of these cases, the amount of the "boost" could me configured, and for back compact
could default to "1.0" (or null to not set a boost at all)
> Furthermore: if we add a new BoostAttrToPayloadAttrFilter that just copied the boost
attribute into the payload attribute, these same filters could give "penalizing" payloads
to terms when used at index time) could give "penalizing" payloads to terms.

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