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From "Hoss Man (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1093) SpanFirstQuery modification to aid term boosting based on position.
Date Wed, 19 Dec 2007 05:00:47 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1093?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12553232
] 

Hoss Man commented on LUCENE-1093:
----------------------------------

NOTE: this should be an option, not a change to the default behavior (right now a SpanFirstQuery
always returns Spans the same size as it's subquery ... changing this could radically affect
the scores users get from existing queries.

API that seems like it would make the most sense is a new boolean getter/setter that defaults
to false ... no idea what agood descriptive name for it would be.


(I too thought we added this a long time ago, i remember asking about it when i was writing
 unit tests for SpanQuery.explain)

> SpanFirstQuery modification to aid term boosting based on position.
> -------------------------------------------------------------------
>
>                 Key: LUCENE-1093
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1093
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Query/Scoring
>            Reporter: Peter Keegan
>
> This is a request for a modification to SpanFirstQuery that would allow term boosting
based on a term's distance from the beginning of the document.
> This modification to SpanFirstQuery would be that the Spans returned by SpanFirstQuery.getSpans()
must always return 0 from its start() method. Then the slop passed to sloppyFreq(slop) would
be the distance from the beginning of the indexed field to the end of the Spans of the SpanQuery
passed to SpanFirstQuery.
> Here is the discussion behind this issue:
> http://www.nabble.com/Can-I-do-boosting-based-on-term-postions--to11939423.html#a11939423

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