SOLR nested entities query (Oracle SQL DIH) - solr

Question

I want to setup my SOLR (8.5.2) schema in such a way that I can query a parent entity and get the child entities associated with it all in the same result. For example:
{
entityId: 1,
entityName: "something"
locations: [ ( <- nested entity)
{
locationId: 1,
locationName: "something"
},
{
locationId: 2,
locationName "something"
}
]
}
I have managed to import the data from an Oracle Database with nested entities, here's my dataconfig.xml
<document name="entities">
<entity name="entity"
query="select * from LIC_ENTITIES" >
<field column="ENT_ID" name="entityId"/>
<field column="NOMBRE" name="entityName"/>
<entity name="entity_locations"
child="true"
query="select * from LIC_ENTITIES_LOCATIONS where ent_ent_id ='${entity.ENT_ID}'">
<field column="LOC_ID" name="locationId"/>
<field column="NOMBRE" name="locationName"/>
</entity>
</entity>
</document>
Here's the schema.xml fields configuration:
<!-- If you don't use child/nested documents, then you should remove the next two fields: -->
<!-- for nested documents (minimal; points to root document) -->
<field name="_root_" type="string" indexed="true" stored="true" docValues="false" />
<!-- for nested documents (relationship tracking) -->
<field name="_nest_path_" type="_nest_path_" indexed="true" stored="true"/>
<fieldType name="_nest_path_" class="solr.NestPathField" />
<field name="_text_" type="text_general" indexed="true" stored="false" multiValued="true"/>
<field name="entityId" type="pint" docValues="false" indexed="true" stored="true"/>
<field name="entityName" type="string" docValues="false" indexed="true" stored="true"/>
<field name="locationId" type="pint" docValues="false" indexed="true" stored="true"/>
<field name="locationName" type="string" docValues="false" indexed="true" stored="true"/>
All the data is imported and I can query it just fine, but I can't query a parent entity and get the child entities at the same time.
I've tried using the Child Transformer (e.g [child parentFilter=entityId:274939]) but I get the following error :
Parent filter should not be sent when the schema is nested
I've tried using Block Join Query (e.g q={!parent which="entityId:274939"}) but it only returns either the parent or the child records.
I've tried using a multi-valued field to store the child elements but it that creates a flat array making it harder to select the child elements.
I've had to create separate entities and then make the relation between them in Node by querying them separately but I wanted to simplify it by having SOLR deliviring the data already formatted the way I wanted.
Is there any way to achieve this kind of result?

Answer 1

unfortunately currently available DIH does not support this field and solr drop support of dih. Currently it is going in sparete project and has few comunity support.