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Date: Mon, 4 Oct 2010 18:32:32 -0400 (EDT)
From: "Robert Muir (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Subject: [jira] Updated: (LUCENE-2529) always apply position increment gap
 between values
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     [ https://issues.apache.org/jira/browse/LUCENE-2529?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Muir updated LUCENE-2529:
--------------------------------

    Attachment: LUCENE-2529_nonsenseIncrements.patch

attached is a patch for BaseTokenStreamTestCase that tests if the first value has a posInc=0 (nonsensical position increment).

The synonymfilter from solr fails with the test, but I don't really care... there is no point in indexing your text if you are going to put useless values in the index... I still think we should throw hard exception here.


> always apply position increment gap between values
> --------------------------------------------------
>
>                 Key: LUCENE-2529
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2529
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>    Affects Versions: 2.9.3, 3.0.2, 3.1, 4.0
>         Environment: (I don't know which version to say this affects since it's some quasi trunk release and the new versioning scheme confuses me.)
>            Reporter: David Smiley
>            Assignee: Koji Sekiguchi
>            Priority: Minor
>             Fix For: 3.1, 4.0
>
>         Attachments: LUCENE-2529_always_apply_position_increment_gap_between_values.patch, LUCENE-2529_nonsenseIncrements.patch, LUCENE-2529_skip_posIncr_for_1st_token.patch, LUCENE-2529_skip_posIncr_for_1st_token.patch, LUCENE-2529_skip_posIncr_for_1st_token.patch, LUCENE-2529_test.patch
>
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> I'm doing some fancy stuff with span queries that is very sensitive to term positions.  I discovered that the position increment gap on indexing is only applied between values when there are existing terms indexed for the document.  I suspect this logic wasn't deliberate, it's just how its always been for no particular reason.  I think it should always apply the gap between fields.  Reference DocInverterPerField.java line 82:
> if (fieldState.length > 0)
>           fieldState.position += docState.analyzer.getPositionIncrementGap(fieldInfo.name);
> This is checking fieldState.length.  I think the condition should simply be:  if (i > 0).
> I don't think this change will affect anyone at all but it will certainly help me.  Presently, I can either change this line in Lucene, or I can put in a hack so that the first value for the document is some dummy value which is wasteful.

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