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https://issues.apache.org/jira/browse/SOLR-13720?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mikhail Khludnev reassigned SOLR-13720:
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Assignee: Mikhail Khludnev
> Impossible to create effective ToParenBlockJoinQuery in custom QParser
> ----------------------------------------------------------------------
>
> Key: SOLR-13720
> URL: https://issues.apache.org/jira/browse/SOLR-13720
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: query parsers
> Affects Versions: 8.2
> Reporter: Stanislav Livotov
> Assignee: Mikhail Khludnev
> Priority: Minor
> Labels: noob
> Fix For: 8.3
>
> Attachments: SOLR-13720.patch
>
>
> According to Solr [ducumentation|#SolrPlugins-QParserPlugin] QParser is
> treated as a legal plugin.
>
> However, it is impossible to create an effective ToParentBlockJoin query
> without copy-pasting(BitDocIdSetFilterWrapper class and getCachedFilter
> method from BlockJoinParentQParser) or dirty hacks(like creating
> org.apache.solr.search.join package with some accessor method to
> package-private methods in plugin code and adding it in WEB-INF/lib directory
> in order to be loaded by the same ClassLoader).
> I don't see a truly clean way how to fix it, but at least we can help custom
> plugin developers to create it a little bit easier by making
> BlockJoinParentQParser#getCachedFilter public and
> BlockJoinParentQParser#BitDocIdSetFilterWrapper and providing getter for
> BitDocIdSetFilterWrapper#filter.
>
>
> In order to create
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