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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