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https://issues.apache.org/jira/browse/SOLR-2339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12987888#action_12987888
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Hoss Man commented on SOLR-2339:
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I'm not sure the best way to go about this ... we could reimplement the basic
termcount vs doccount check that use to be done at a higher level before using
the FieldCache -- but that may be overkill and i'm not convinced we need to
behave in exactly the same way as before.
At a minimum we should probably start logging a warning if someone does a sort
on a field that is configured to be multiValued=true.
Alternately: we could consider adding a property to the StringIndex and
DocTermsIndex classes (on their respective branches) so that FieldCache could
indicate when it suspects there may be a problem (using simple doccount <
termcount, or something more complex if it's easy), and Solr could error/log if
that property is set.
> No error reported when sorting on a field Solr knows you shouldn't sort on.
> ---------------------------------------------------------------------------
>
> Key: SOLR-2339
> URL: https://issues.apache.org/jira/browse/SOLR-2339
> Project: Solr
> Issue Type: Bug
> Components: search
> Reporter: Hoss Man
> Assignee: Hoss Man
> Fix For: 3.1, 4.0
>
>
> In the past, Solr has relied on the underlying FieldCache to throw an error
> in situations where sorting on a field was not possible. however LUCENE-2142
> has changed this, so that FieldCache never throws an error.
> In order to maintain the functionality of past Solr releases (ie: error when
> users attempt to sort on a field that we known will produce meaningless
> results) we should add some sort of check at the Solr level.
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