[jira] Commented: (SOLR-2339) No error reported when sorting on a field Solr knows you shouldn't sort on.

["Hoss Man (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-2339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12987888#action_12987888 ] 

Hoss Man commented on SOLR-2339:
--------------------------------

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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