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https://issues.apache.org/jira/browse/SOLR-10521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16037586#comment-16037586
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Cassandra Targett commented on SOLR-10521:
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[~mkhludnev] - Yes it looks good. +1, thanks.
> sort by string field of the nested child when searching with {!parent}
> ----------------------------------------------------------------------
>
> Key: SOLR-10521
> URL: https://issues.apache.org/jira/browse/SOLR-10521
> Project: Solr
> Issue Type: New Feature
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Mikhail Khludnev
> Fix For: 6.6, master (7.0)
>
> Attachments: SOLR-10521-6x.patch, SOLR-10521-doc.patch,
> SOLR-10521.patch, SOLR-10521.patch, SOLR-10521.patch, SOLR-10521.patch,
> SOLR-10521-raw.patch
>
>
> The idea is to integrate Lucene's {{ToParentBlockJoinSortField}}
> The approach to hookup -it- is -a little bit tricky-:
> -{{sort=\{!childfield bjq=$q field=COLOR_s}desc}}-
> {{sort=\childfield(COLOR_s,$q) desc}}
> the question no.1 wdyt about the syntax?
> internally it creates a function query with valueSource which produces
> {{ToParentBlockJoinSortField}}
> The main challenge is picking Solr field type from
> {{ToParentBlockJoinSortField}}, because as-is it's broken on {{mergeIds}} -
> ByteRefs need to be properly marshaled and unmarshalled by a field type from
> the child scope.
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