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Posted to dev@lucene.apache.org by "Michael Gibney (JIRA)" <ji...@apache.org> on 2018/12/17 20:15:00 UTC
[jira] [Resolved] (LUCENE-8610) NPE in TermsHashPerField.add() for
TokenStreams with lazily instantiated token Attributes
[ https://issues.apache.org/jira/browse/LUCENE-8610?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Michael Gibney resolved LUCENE-8610.
------------------------------------
Resolution: Not A Bug
Lucene Fields: (was: New,Patch Available)
Will look at addressing this in {{solr.PreAnalyzedAnalyzer}}. There may be other {{TokenStreams}} that don't strictly follow the requirement to initialize all token Attributes on instantiation, but as of now nothing relating to this issue is known to be broken.
> NPE in TermsHashPerField.add() for TokenStreams with lazily instantiated token Attributes
> -----------------------------------------------------------------------------------------
>
> Key: LUCENE-8610
> URL: https://issues.apache.org/jira/browse/LUCENE-8610
> Project: Lucene - Core
> Issue Type: Wish
> Components: core/index
> Affects Versions: 7.4, master (8.0)
> Reporter: Michael Gibney
> Priority: Minor
> Attachments: LUCENE-8610.patch
>
>
> {{DefaultIndexingChain.invert(...)}} calls {{invertState.setAttributeSource(stream)}} before {{stream.incrementToken()}} is called.
> For instances of {{stream}} that lazily instantiate token attributes (e.g., as {{solr.PreAnalyzedField$PreAnalyzedTokenizer}} does upon the first call to {{incrementToken()}} that returns {{true}}), this can result in caching a {{null}} value in {{invertState.termAttribute}} for a given {{stream}} instance.
> Subsequent calls that reuse the same {{stream}} instance (reusing {{TokenStreamComponents}}) for field values with at least 1 token will call {{termHashPerField.start(...)}} which sets {{termsHashPerField.termAtt}} from the {{null}} value cached in the {{FieldInvertState.termAttribute}}. An NPE would be thrown when {{termsHashPerField.add()}} reasonably but incorrectly assumes a non-null value for {{termAtt}}.
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