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https://issues.apache.org/jira/browse/SOLR-5743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14298423#comment-14298423
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Dr Oleg Savrasov commented on SOLR-5743:
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In order to utilize proposed component, you need to configure it in
solrconfig.xml and introduce some search handler which uses it, for example
<searchComponent name="blockJoinFacet"
class="org.apache.solr.handler.component.BlockJoinFacetComponent">
</searchComponent>
<requestHandler name="/blockJoinFacetRH"
class="org.apache.solr.handler.component.SearchHandler">
<arr name="last-components">
<str>blockJoinFacet</str>
</arr>
</requestHandler>
Please notice that only string docValues fields could be used for faceting, int
type can be covered later, so you need to update appropriate fields
configuration in schema.xml file, for example
<field name="COLOR_s" type="string" indexed="true" stored="true"
docValues="true"/>
<field name="SIZE_s" type="string" indexed="true" stored="true"
docValues="true"/>
Then after indexing some set of hierarchical documents like
<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="type_s">child</field>
<field name="COLOR_s">Red</field>
<field name="SIZE_s">XL</field>
</doc>
<doc>
<field name="id">12</field>
<field name="type_s">child</field>
<field name="COLOR_s">Blue</field>
<field name="SIZE_s">XL</field>
</doc>
</doc>
you need to pass required ToParentBlockJoinQuery to the configured request
handler, for example
http://localhost:8983/solr/collection1/blockJoinFacetRH?q={!parent+which%3D%22type_s%3Aparent%22}type_s%3Achild&wt=json&indent=true&facet=true&child.facet.field=COLOR_s&child.facet.field=SIZE_s
and it yields you the desired result
{
"responseHeader":{
"status":0,
"QTime":1},
"response":{"numFound":1,"start":0,"docs":[
{
"id":"10",
"type_s":"parent",
"BRAND_s":"Nike",
"_version_":1491642108914696192}]
},
"facet_counts":{
"facet_queries":{},
"facet_fields":{},
"facet_dates":{},
"facet_ranges":{},
"facet_intervals":{},
"facet_fields":[
"COLOR_s",[
"Blue",1,
"Red",1],
"SIZE_s",[
"XL",1]]}}
Please take the latest patch, it contains fix related to just found caching
issue.
> Faceting with BlockJoin support
> -------------------------------
>
> Key: SOLR-5743
> URL: https://issues.apache.org/jira/browse/SOLR-5743
> Project: Solr
> Issue Type: New Feature
> Reporter: abipc
> Labels: features
> Attachments: SOLR-5743.patch, SOLR-5743.patch, SOLR-5743.patch
>
>
> 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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