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Posted to dev@lucene.apache.org by "David Mason (Updated) (JIRA)" <ji...@apache.org> on 2012/04/13 06:47:28 UTC
[jira] [Updated] (LUCENE-3979) NGramTokenizer strips whitespace,
with no option to keep leading and trailing whitespace
[ https://issues.apache.org/jira/browse/LUCENE-3979?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
David Mason updated LUCENE-3979:
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Summary: NGramTokenizer strips whitespace, with no option to keep leading and trailing whitespace (was: NGramTokenizer)
> NGramTokenizer strips whitespace, with no option to keep leading and trailing whitespace
> ----------------------------------------------------------------------------------------
>
> Key: LUCENE-3979
> URL: https://issues.apache.org/jira/browse/LUCENE-3979
> Project: Lucene - Java
> Issue Type: Bug
> Components: modules/analysis
> Affects Versions: 2.9.2, 3.0
> Environment: n/a
> Reporter: David Mason
> Priority: Minor
> Labels: tokenizer, whitespace
> Original Estimate: 5m
> Remaining Estimate: 5m
>
> org.apache.lucene.analysis.ngram.NGramTokenizer removes whitespace, making a search for literal strings like " test" and "test " equivalent to "test". Searching with relevant whitespace is sometimes desired, particularly where ngrams are used.
> This could be fixed by either removing .trim() from the line shown below, or by providing a flag to specifically set trimming behaviour (keeping trim=true as the default so that existing code using this analyzer is not broken).
> 111: inStr = new String(chars).trim(); // remove any trailing empty strings
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