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From "Robert Muir (JIRA)" <>
Subject [jira] [Commented] (LUCENE-3395) FreqFilteringScorerWrapper and min/max freq options on TermQuery
Date Mon, 22 Aug 2011 18:47:29 GMT


Robert Muir commented on LUCENE-3395:

i mainly don't see any harm in adding these options to TermQuery, we can do it so that TermScorer
is only wrapped if these options are used, so theres no performance downside for existing
users who don't care.

Well I think there is a downside? Because if we hook it straight into this query, then someone
will want it in SpanTermQuery, and PayloadTermQuery, and PhraseQuery, and their own queries???...

1) Is there a straight forward / easy template for non-expert java users to take an arbitrary
Query and override it's Scorer with a wrapper like this?

Yes! I think we should make a query that wraps another query to do this? Similar to ConstantScoreQuery?

> FreqFilteringScorerWrapper and min/max freq options on TermQuery
> ----------------------------------------------------------------
>                 Key: LUCENE-3395
>                 URL:
>             Project: Lucene - Java
>          Issue Type: New Feature
>            Reporter: Hoss Man
>         Attachments: LUCENE-3395.patch
> A Solr User was asking about how specify a minimum tf when searching for a term (ie:
documents matching "dog" at least 3 times).
> Based on a conversation with rmuir on IRC, that led me to realize that we now explicitly
expose a general "freq()" method on Scorer, and that min/max freq constraints could be implemented
as a general Scorer Wrapper.
> I propose that we add such a wrapper, and add setMinFreq(float)/setMaxFreq(float) methods
to TermQuery (similar to the minNumShouldMatches and disableCoord type setters in BooleanQuery)
that cause it to be used automatically.

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