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https://issues.apache.org/jira/browse/SOLR-5743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15098859#comment-15098859
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Vijay Sekhri commented on SOLR-5743:
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Hi Mikhail, Dr. Oleg
The requirement to use this feature is to have ToParentBlockJoinQuery like
q={!parent which=<allParents>}<someChildren>.
To use the ParentBlockJoinQuery it needs to search on fields present in child
document. In real world your parent document would have most of the common
fields and child document would have only the different fields. For example
just like BRAND_s, there will be fields like description_s, name_s, title_s,
partnumber_s, etc. in the parent document only. As they are same for all the
child documents , one would not repeat them in the child document, rather only
keep them in the parent document only. In the child document , we would have
attributes like COLOR_s, SIZE_s as the differ.
Now for any real searches , one would search for fields like BRAND_s,
description_s, name_s, title_s, partnumber_s, etc to return appropriate
documents. However , those fields are only present in parent docs.
So searching them like q={!parent
which=type_s:parent}BRAND_s:Nike&facet=true&child.facet.field=COLOR_s does not
work because search on BRAND_s:Nike is present in parent document . It gives
this error also
child query must only match non-parent docs, but parent docID=2 matched
childScorer=class org.apache.lucene.search.TermScorer
One could search on fields from child like this without any problem.
q={!parent%20which=type_s:parent}COLOR_s:Blue&facet=true&child.facet.field=COLOR_s
To use this feature do we have to copy all the common fields ( and thousands of
such fields alike ) back into the child (repeating them for every child) and
search on those fields ? For example copying brand_s field like this
[{
"id": 10,
"type_s": "parent",
"BRAND_s": "Nike",
"_childDocuments_": [{
"id": 11,
"COLOR_s": "Red",
"SIZE_s": "XL",
"BRAND_s": "Nike",
},
{
"id": 12,
"COLOR_s": "Blue",
"SIZE_s": "XL",
"BRAND_s": "Nike",
}]
}]
This way the query works
q={!parent which=type_s:parent}BRAND_s:Nike&facet=true&child.facet.field=COLOR_s
Or there is some other way where we can still use the facets on the child
fields (SIZE_s) , aggregate the counts on the parent docs (id:10) and still
search on the common fields from parent docs (BRAND_s) ?
> 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
>
> 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
>
>
> 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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