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https://issues.apache.org/jira/browse/LUCENE-5961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14139672#comment-14139672
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Hoss Man commented on LUCENE-5961:
----------------------------------
discovered this while working on tests for SOLR-6354.
As part of that issue i'm updating StatsComponentTest.java with some commented
out assertions that can be re-enabled once this issue is resolved (grep for
"SOLR-6354")
> FunctionValues.exist(int) isn't returning false in cases where it should for
> many "math" based value sources
> ------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-5961
> URL: https://issues.apache.org/jira/browse/LUCENE-5961
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Hoss Man
> Attachments: LUCENE-5961.patch
>
>
> The FunctionValues class contains an exist(int doc) method with a default
> implementation that returns true - field based DocValues override this method
> as appropriate, but most of the "function" based subclasses in the code
> (typically anonymous subclasses of "FloatDocValues") don't override this
> method when wrapping other ValueSources.
> So for example: the FunctionValues returned by
> ProductFloatFunction.getValues() will say that a value exists for any doc,
> even if that ProductFloatFunction wraps two FloatFieldSources that don't
> exist for any docs
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