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https://issues.apache.org/jira/browse/SOLR-5231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13763826#comment-13763826
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Yonik Seeley commented on SOLR-5231:
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Nice tracking that down Hoss... that was definitely tricky.
So it looks like this was caused by LUCENE-4547, and hence a bug since 4.2
> When a boolean field is missing from a doc it is sometimes treated as "true"
> by the "if" function (based on other docs in segment?)
> -----------------------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-5231
> URL: https://issues.apache.org/jira/browse/SOLR-5231
> Project: Solr
> Issue Type: Bug
> Affects Versions: 4.4
> Reporter: Hoss Man
> Attachments: SOLR-5231.patch
>
>
> This issue is hard to explain with out a long example.
> crux of the problem is that the behavior of the if function, wrapped arround
> a boolean field (ie: "{{if(fieldName,x,y)}}" ) is not consistent for
> documents that do not have any value for that functio -- the behavior seems
> to depend on whether or not other documents in the same segment have a value
> for that field.
> for brevity, details will follow in a comment - but i've been able to
> reproduce on trunk, 4.3, and 4.3 (didn't look back farther then that)
> the work around is to explicitly use the {{exists()}} function in the if
> condition (ie: "{{if(exists(fieldName),x,y)}}" )
> (Thanks to Elodie Sannier for reporting the initial symptoms of this on the
> mailing list)
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