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https://issues.apache.org/jira/browse/LUCENE-8723?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nicolás Lichtmaier updated LUCENE-8723:
---------------------------------------
    Affects Version/s: 8.0

> Bad interaction bewteen WordDelimiterGraphFilter, StopFilter and 
> FlattenGraphFilter
> -----------------------------------------------------------------------------------
>
>                 Key: LUCENE-8723
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8723
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: modules/analysis
>    Affects Versions: 7.7.1, 8.0
>            Reporter: Nicolás Lichtmaier
>            Priority: Major
>
> I was debugging an issue (missing tokens after analysis) and when I enabled 
> Java assertions I uncovered a bug when using WordDelimiterGraphFilter + 
> StopFilter + FlattenGraphFilter.
> I could reproduce the issue in a small piece of code. This code gives an 
> assertion failure when assertions are enabled (-ea java option):
> {code:java}
>     Builder builder = CustomAnalyzer.builder();
>     builder.withTokenizer(StandardTokenizerFactory.class);
>     builder.addTokenFilter(WordDelimiterGraphFilterFactory.class, 
> "preserveOriginal", "1");
>     builder.addTokenFilter(StopFilterFactory.class);
>     builder.addTokenFilter(FlattenGraphFilterFactory.class);
>     Analyzer analyzer = builder.build();
>      
>     TokenStream ts = analyzer.tokenStream("*", new StringReader("x7in"));
>     ts.reset();
>     while(ts.incrementToken())
>         ;
> {code}
> This gives:
> {code}
> Exception in thread "main" java.lang.AssertionError: 2
>      at 
> org.apache.lucene.analysis.core.FlattenGraphFilter.releaseBufferedToken(FlattenGraphFilter.java:195)
>      at 
> org.apache.lucene.analysis.core.FlattenGraphFilter.incrementToken(FlattenGraphFilter.java:258)
>      at com.wolfram.textsearch.AnalyzerError.main(AnalyzerError.java:32)
> {code}
> Maybe removing stop words after WordDelimiterGraphFilter is wrong, I don't 
> know. However is the only way to process stop-words generated by that filter. 
> In any case, it should not eat tokens or produce assertions. 



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