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https://issues.apache.org/jira/browse/LUCENE-1420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12643231#action_12643231
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Andrzej Bialecki commented on LUCENE-1420:
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Thanks for a thorough review. I'm fine with these changes, and the idea to
gently introduce discountOverlaps in the Similarity API is great. Please go
ahead if there are no further objections.
> Similarity.lengthNorm and positionIncrement=0
> ---------------------------------------------
>
> Key: LUCENE-1420
> URL: https://issues.apache.org/jira/browse/LUCENE-1420
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: 2.3.3, 2.9
> Reporter: Andrzej Bialecki
> Assignee: Michael McCandless
> Fix For: 2.3.3, 2.9
>
> Attachments: LUCENE-1420.patch, similarity-v2.patch, similarity.patch
>
>
> Calculation of lengthNorm factor should in some cases take into account the
> number of tokens with positionIncrement=0. This should be made optional, to
> support two different scenarios:
> * when analyzers insert artificially constructed tokens into TokenStream
> (e.g. ASCII-fied versions of accented terms, stemmed terms), and it's
> unlikely that users submit queries containing both versions of tokens: in
> this case lengthNorm calculation should ignore the tokens with
> positionIncrement=0.
> * when analyzers insert synonyms, and it's likely that users may submit
> queries that contain multiple synonymous terms: in this case the lengthNorm
> should be calculated as it is now, i.e. it should take into account all terms
> no matter what is their positionIncrement.
> The default should be backward-compatible, i.e. it should count all tokens.
> (See also the discussion here: http://markmail.org/message/vfvmzrzhr6pya22h )
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