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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1941) MinPayloadFunction returns 0 when only one payload is present
Date Fri, 12 Feb 2010 10:26:27 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12832931#action_12832931
] 

Michael McCandless commented on LUCENE-1941:
--------------------------------------------

This is a real bug -- it happens because PayloadTermQuery (and PayloadNearQuery) processPayload
calls the payload scoring function, passing in the old score and the new one.

The problem is the old score always defaults to 0.0.  Ie it doesn't handle the first payload
properly -- first payload should set the value for min/max.  So you won't hit this if your
min is < 0.

MaxPayloadFunction has the bug as well, but you won't hit it if your max is > 0.

> MinPayloadFunction returns 0 when only one payload is present
> -------------------------------------------------------------
>
>                 Key: LUCENE-1941
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1941
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Query/Scoring
>    Affects Versions: 2.9
>            Reporter: Erik Hatcher
>             Fix For: 3.0.1, 3.1
>
>
> In some experiments with payload scoring through PayloadTermQuery, I'm seeing 0 returned
when using MinPayloadFunction.  I believe there is a bug there.  No time at the moment to
flesh out a unit test, but wanted to report it for tracking.

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