[jira] [Created] (SOLR-8208) DocTransformer executes sub-queries

["Mikhail Khludnev (JIRA)" <ji...@apache.org>]

Mikhail Khludnev created SOLR-8208:
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             Summary: DocTransformer executes sub-queries
                 Key: SOLR-8208
                 URL: https://issues.apache.org/jira/browse/SOLR-8208
             Project: Solr
          Issue Type: Improvement
            Reporter: Mikhail Khludnev


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 them 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 allow to specify subquery parameter prefix:
{code}
..&fl=id,[subquery paramPrefix=subq1. fromIndex=othercore],score,..&subq1.q={!term f=child_id v=$subq1.row.id}&subq1.rows=3&subq1.sort=price&..
{code}       
* {{paramPrefix=subq1.}} shifts parameters for subquery: {{subq1.q}} turns to {{q}} for subquery, {{subq1.rows}} to {{rows}}
* {{fromIndex=othercore}} optional param allows to run subquery on other core, like it works on query time join
* the itchiest one is to reference to document field from subquery parameters, here I propose to use local param {{v}} and param deference {{v=$param}} thus every document field implicitly introduces parameter for subquery $\{paramPrefix\}row.$\{fieldName\}, thus above subquery is q=child_id:<doc.getField("id")>, presumably we can drop "row." in the middle (reducing to v=$subq1.id), until someone deal with {{rows}}, {{sort}} fields. 
* \[subquery\], or \[query\], or ? 

Caveat: it should be a way slow; it handles only search result page, not entire result set. 



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