[jira] [Created] (LUCENE-6667) Custom attributes get cleared by filters

["Oliver Becker (JIRA)" <ji...@apache.org>]

Oliver Becker created LUCENE-6667:
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             Summary: Custom attributes get cleared by filters
                 Key: LUCENE-6667
                 URL: https://issues.apache.org/jira/browse/LUCENE-6667
             Project: Lucene - Core
          Issue Type: Bug
    Affects Versions: 4.10.4
            Reporter: Oliver Becker


I believe the Lucene API enables users to define their custom attributes (by extending {{AttributeImpl}}) which may be added by custom Tokenizers. 
It seems, the {{clear}} and {{copyTo}} methods must be implemented to clear and restore the state of this custom attribute.

However, some filters (in our case the SynonymFilter) simply call {{AttributeSource.clearAttributes}} without invoking {{copyTo}}. Instead the filter just resets some known attributes, simply ignoring all other custom attributes. In the end our custom attribute value is lost.

Is this a bug in {{SynonymFilter}} (and others) or are we using the API in the wrong way?

A solution might be of course to provide empty implementations of {{clear}} and {{copyTo}}, but I'm not sure if this has other unwanted effects.



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