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https://issues.apache.org/jira/browse/SOLR-8208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15271411#comment-15271411
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Mikhail Khludnev commented on SOLR-8208:
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hmm... you might be laughing, but game is over.
The problem is to call EmbeddedSolrServer from DocTransformer. This call isn't
possible from thread where SolrRequestInfo is present. So far it's not possible
to suspend and then resume SolrRequestInfo. Juggling with threads complicates
it a lot, however it's possible to manage threads after all, but not
SolrRequestInfo.
[[email protected]] can you suggest an approach?
> DocTransformer executes sub-queries
> -----------------------------------
>
> Key: SOLR-8208
> URL: https://issues.apache.org/jira/browse/SOLR-8208
> Project: Solr
> Issue Type: Improvement
> Reporter: Mikhail Khludnev
> Assignee: Mikhail Khludnev
> Labels: features, newbie
> Attachments: SOLR-8208.diff, SOLR-8208.patch, SOLR-8208.patch,
> SOLR-8208.patch, SOLR-8208.patch, SOLR-8208.patch, SOLR-8208.patch,
> SOLR-8208.patch, SOLR-8208.patch, SOLR-8208.patch, SOLR-8208.patch,
> SOLR-8208.patch, SOLR-8208.patch, SOLR-8208.patch, SOLR-8208.patch,
> SOLR-8208.patch
>
>
> The initial idea was to return "from" side of query time join via
> doctransformer. I suppose it isn't query-time join specific, thus let to
> specify any query and parameters for them, let's call it sub-query. But it
> might be problematic to escape subquery parameters, including local ones,
> e.g. what if subquery needs to specify own doctransformer in &fl=\[..\] ?
> I suppose we can specify subquery parameter prefix:
> {code}
> ..&q=name_s:john&fl=*,depts:[subquery fromIndex=departments]&
> depts.q={!term f=dept_id_s
> v=$row.dept_ss_dv}&depts.fl=text_t,dept_id_s_dv&depts.rows=12&depts.sort=id
> desc
> {code}
> response is like
> {code}
> <response>
> ...
> <result name="response" numFound="1" start="0">
> <doc>
> <str name="id">1</str>
> <str name="name_s_dv">john</str>
> ..
> <result name="depts" numFound="2" start="0">
> <doc>
> <str name="dept_id_s_dv">Engineering</str>
> <str name="text_t">These guys develop stuff</str>
> </doc>
> <doc>
> <str name="dept_id_s_dv">Support</str>
> <str name="text_t">These guys help users</str>
> </doc>
> </result>
> </doc>
> </result>
> </response>
> {code}
> * {{fl=depts:\[subquery]}} executes a separate request for every query result
> row, and adds it into a document as a separate result list. The given field
> name (here it's 'depts') is used as a prefix to shift subquery parameters
> from main query parameter, eg {{depts.q}} turns to {{q}} for subquery,
> {{depts.rows}} to {{rows}}.
> * document fields are available as implicit parameters with prefix {{row.}}
> eg. if result document has a field {{dept_id}} it can be referred as
> {{v=$row.dept_id}} this combines well with \{!terms} query parser
> * {{separator=','}} is used when multiple field values are combined in
> parameter. eg. a document has multivalue field {code}dept_ids={2,3}{code},
> thus referring to it via {code}..&dept.q={!terms f=id
> v=$row.dept_ids}&..{code} executes a subquery {code}{!terms f=id}2,3{code}.
> When omitted it's a comma.
> * {{fromIndex=othercore}} optional param allows to run subquery on other
> core, like it works on query time join
> However, it doesn't work on cloud setup (and will let you know), but it's
> proposed to use regular params ({{collection}}, {{shards}} - whatever, with
> subquery prefix as below ) to issue subquery to a collection
> {code}
> q=name_s:dave&indent=true&fl=*,depts:[subquery]&rows=20&
> depts.q={!terms f=dept_id_s v=$row.dept_ss_dv}&depts.fl=text_t&
> depts.indent=true&
> depts.collection=departments&
> depts.rows=10&depts.logParamsList=q,fl,rows,row.dept_ss_dv
> {code}
> Caveat: it should be a way slow; it handles only search result page, not
> entire result set.
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