always apply position increment gap between values
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Key: LUCENE-2529
URL: https://issues.apache.org/jira/browse/LUCENE-2529
Project: Lucene - Java
Issue Type: Improvement
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
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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