[jira] Updated: (LUCENE-1093) SpanFirstQuery modification to aid term boosting based on position.

["Paul Elschot (JIRA)" <ji...@apache.org>]

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

Paul Elschot updated LUCENE-1093:
---------------------------------

    Attachment: SpanFirst20071219.patch

This 20071219 patch adds a private flag and a constructor for this flag to SpanFirstQuery. The flag indicates whether the start of the resulting Spans should be zero or default to the start of the given spans.

ant -Dtestcase='Test*Span*' test-core
passes independent of whether or not this flag is set by default, so some more  tests are needed.


> 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
>         Attachments: SpanFirst20071219.patch
>
>
> 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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