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

["Cao Manh Dat (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-8208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15057301#comment-15057301 ] 

Cao Manh Dat commented on SOLR-8208:
------------------------------------

[~mkhludnev] I really want to work on this issue, can you assign this issue to me?

> DocTransformer executes sub-queries
> -----------------------------------
>
>                 Key: SOLR-8208
>                 URL: https://issues.apache.org/jira/browse/SOLR-8208
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Mikhail Khludnev
>              Labels: features, newbie
>
> 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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