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https://issues.apache.org/jira/browse/LUCENE-9568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17211079#comment-17211079
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Michael McCandless commented on LUCENE-9568:
--------------------------------------------
Here's the user list discussion leading to this issue:
[https://markmail.org/thread/2gomdeis3xs7gs5t]
... where [~msoko...@gmail.com] suggested:
{noformat}
I traced this to this block in FuzzyTermsEnum:
if (ed == 0) { // exact match
boostAtt.setBoost(1.0F);
} else {
final int codePointCount = UnicodeUtil.codePointCount(term);
int minTermLength = Math.min(codePointCount, termLength);
float similarity = 1.0f - (float) ed / (float) minTermLength;
boostAtt.setBoost(similarity);
}
where in your test ed (edit distance) was 2 and minTermLength 1,
leading to negative boost.
I don't really understand this code at all, but I wonder if it should
divide by maxTermLength instead of minTermLength? {noformat}
I think his proposal makes sense? That would make {{similarity}} 0 for this
case, which seems right, since the term is length 1, the candidate is edit
distance 2 away, and is surely very irrelevant!
> FuzzyTermEnums sets negative boost for fuzzy search & highlight
> ---------------------------------------------------------------
>
> Key: LUCENE-9568
> URL: https://issues.apache.org/jira/browse/LUCENE-9568
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/highlighter
> Affects Versions: 8.5.1
> Reporter: Juraj Jurčo
> Priority: Minor
> Labels: highlighting, newbie
> Attachments: FindSqlHighlightTest.java
>
>
> *Description*
> When user indexes a word with an apostrophe and constructs a fuzzy query for
> highlighter, it throws an exception with set negative boost for a query.
> *Repro Steps*
> # Index a text with apostrophe. E.g. doesn't
> # Parse a fuzzy query e.g.: se~, se~2, se~3
> # Try to highlight a text with apostrophe
> # The exception is thrown (for details see attached test test with repro
> steps)
> *Actual Result*
> {{java.lang.IllegalArgumentException: boost must be a positive float, got
> -1.0}}
> *Expected Result*
> * No exception.
> * Highlighting marks are inserted into a text.
> *Workaround*
> - not known.
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