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https://issues.apache.org/jira/browse/SOLR-10909?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16052872#comment-16052872
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Erick Erickson commented on SOLR-10909:
---------------------------------------
Please raise issues like this on the user's list _first_. If it's determined
that it's actually a code issue, _then_ raise a JIRA.
> Cannot sort by function
> ------------------------
>
> Key: SOLR-10909
> URL: https://issues.apache.org/jira/browse/SOLR-10909
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Server
> Affects Versions: 6.4.1
> Environment: ubuntu 14.4
> Reporter: David Liu
>
> I have two fields in my solr schema: *solr_weight* and *brand*, I want to
> implement one query which can dynamically put all brand=XX data in first, and
> then show others and sort by solr_weight,
> so, I use *if* and *sum* function in solr sort to do it, however, looks like
> a bug because *if* doesn't work in sort
> {quote}sort=if(brand=="3701"; sum(solr_weight,250000); solr_weight )
> desc{quote}
> {quote}ERROR: "msg":"Can't determine a Sort Order (asc or desc) in sort spec
> 'if(brand==\"3701\"; sum(solr_weight,250000); solr_weight ;) desc',
> pos=19",{quote}
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