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https://issues.apache.org/jira/browse/SOLR-5743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15159247#comment-15159247
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Mikhail Khludnev commented on SOLR-5743:
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This, NPE is pretty strange, it's a gap in error handling functionality, but
request log has status=0 it couldn't happen if an exception occurs. These query
parameters can't enable BlockJoinFacet component. Actual query parameters
causing this NPE should follow stacktrace.
> Faceting with BlockJoin support
> -------------------------------
>
> Key: SOLR-5743
> URL: https://issues.apache.org/jira/browse/SOLR-5743
> Project: Solr
> Issue Type: New Feature
> Components: faceting
> Reporter: abipc
> Assignee: Mikhail Khludnev
> Labels: features
> Fix For: 5.5, master
>
> Attachments: SOLR-5743.patch, SOLR-5743.patch, SOLR-5743.patch,
> SOLR-5743.patch, SOLR-5743.patch, SOLR-5743.patch, SOLR-5743.patch,
> SOLR-5743.patch, SOLR-5743.patch, SOLR-5743.patch, SOLR-5743.patch,
> SOLR-5743.patch, SOLR-5743.patch, SOLR-5743.patch, SOLR-5743.patch,
> cluster.jpg, service_baseline.png, service_new_baseline.jpg,
> solr_baseline.jpg, solr_new_baseline.jpg
>
>
> For a sample inventory(note - nested documents) like this -
> <doc>
> <field name="id">10</field>
> <field name="type_s">parent</field>
> <field name="BRAND_s">Nike</field>
> <doc>
> <field name="id">11</field>
> <field name="COLOR_s">Red</field>
> <field name="SIZE_s">XL</field>
> </doc>
> <doc>
> <field name="id">12</field>
> <field name="COLOR_s">Blue</field>
> <field name="SIZE_s">XL</field>
> </doc>
> </doc>
> Faceting results must contain -
> Red(1)
> XL(1)
> Blue(1)
> for a "q=*" query.
> PS : The inventory example has been taken from this blog -
> http://blog.griddynamics.com/2013/09/solr-block-join-support.html
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