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https://issues.apache.org/jira/browse/LUCENE-8908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16887518#comment-16887518
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Hoss Man commented on LUCENE-8908:
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[~munendrasn] at first glance this looks good ... but i'm wondering if this
actually fixes all of the examples i mentioned when this was opened -- in
particular things like {{exists(query($qx,0))}} vs {{exists(query($qx))}} ...
those should return different things depending on whether the doc matches $qx
or not.
IIRC that would require modifying QueryDocValues.exists() to return "true"
anytime there is a defVal, but i don't think that's really possible ATM because
it's a {float}} (not a nullable Float) ... and i'm not sure off the top of my
head that it would even be the ideal behavior for the QueryDocValues code ? ...
maybe the solr ValueSourceParser logic should be changed to put an explicit
wrapper around the QueryValueSource when a default is (isn't?) used ... not
sure, i haven't looked / thought about this code in a long time.
> Specified default value not returned for query() when doc doesn't match
> -----------------------------------------------------------------------
>
> Key: LUCENE-8908
> URL: https://issues.apache.org/jira/browse/LUCENE-8908
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Bill Bell
> Priority: Major
> Attachments: LUCENE-8908.patch, SOLR-7845.patch, SOLR-7845.patch
>
>
> The 2 arg version of the "query()" was designed so that the second argument
> would specify the value used for any document that does not match the query
> pecified by the first argument -- but the "exists" property of the resulting
> ValueSource only takes into consideration wether or not the document matches
> the query -- and ignores the use of the second argument.
> ----
> The work around is to ignore the 2 arg form of the query() function, and
> instead wrap he query function in def().
> for example: {{def(query($something), $defaultval)}} instead of
> {{query($something, $defaultval)}}
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