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From "Mikhail Khludnev (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SOLR-8208) DocTransformer executes sub-queries
Date Tue, 22 Mar 2016 22:39:25 GMT

     [ https://issues.apache.org/jira/browse/SOLR-8208?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mikhail Khludnev updated SOLR-8208:
-----------------------------------
    Attachment: SOLR-8208.patch

attaching a patch which pass existing tests.   now it avoids changes in DocStreamer and SolrQueryRequest.
As a detail, subquery results are represents with <result>, but not <arr> 
{code}
<response>

<lst name="responseHeader">
  <int name="status">0</int>
  <int name="QTime">650</int>
</lst>
<result name="response" numFound="1" start="0">
  <doc>
    <str name="id">1</str>
    <str name="name_s_dv">john</str>
    <str name="title_s_dv">Director</str>
    <arr name="dept_ss_dv">
      <str>Engineering</str>
    </arr>
    <result name="depts" numFound="1" start="0">
      <doc>
        <str name="text_t">These guys develop stuff</str></doc>
    </result></doc>
</result>
</response>
{code}

How do you feel about it? 

> 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
>
>
> 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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