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Posted to dev@lucene.apache.org by "Koji Sekiguchi (JIRA)" <ji...@apache.org> on 2010/09/28 04:24:33 UTC
[jira] Resolved: (LUCENE-2529) always apply position increment gap
between values
[ https://issues.apache.org/jira/browse/LUCENE-2529?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Koji Sekiguchi resolved LUCENE-2529.
------------------------------------
Resolution: Fixed
trunk: Committed revision 1001796 and 1001957.
branch_3x: Committed revision 1001991.
Thanks, David!
> 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
>
> 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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