[jira] [Commented] (SOLR-16183) XML Loader: support indexing single nested child document

["Thomas Corthals (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-16183?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17532237#comment-17532237 ] 

Thomas Corthals commented on SOLR-16183:
----------------------------------------

The JSON Loader recognises both "single-valued" and "multi-valued" pseudo-fields for labelled nested children.
{code:json}
{
  "id": "1",
  "single_child": {
    "id": "2"
  },
  "children": [{
    "id": "3"
  },
  {
    "id": "4"
  }]
}
{code}

This can be queried with {{q=id:1&fl=id,single_child,children,[child]}} to retrieve the nesting as indexed.
{code:json}
{
  "responseHeader":{
    "status":0,
    "QTime":1,
    "params":{
      "q":"id:1",
      "fl":"id,single_child,children,[child]"}},
  "response":{"numFound":1,"start":0,"numFoundExact":true,"docs":[
      {
        "id":"1",
        "single_child":
        {
          "id":"2"},
        "children":[
          {
            "id":"3"},

          {
            "id":"4"}]}]
  }}
{code}

The same response with {{q=id:1&fl=id,single_child,children,[child]&wt=xml}} shows the indexed structure in XML.
{code:xml}
<?xml version="1.0" encoding="UTF-8"?>
<response>

<lst name="responseHeader">
  <int name="status">0</int>
  <int name="QTime">0</int>
  <lst name="params">
    <str name="q">id:1</str>
    <str name="fl">id,single_child,children,[child]</str>
    <str name="wt">xml</str>
  </lst>
</lst>
<result name="response" numFound="1" start="0" numFoundExact="true">
  <doc>
    <str name="id">1</str>
    <doc name="single_child">
      <str name="id">2</str></doc>
    <arr name="children">
      <doc>
        <str name="id">3</str></doc>
      <doc>
        <str name="id">4</str></doc>
    </arr></doc>
</result>
</response>
{code}

However, there is currently no way to have this exact structure indexed with the XML Loader. Borrowing from the XML response, it would make sense to support a {{name}} attribute on a not-in-a-{{<field>}} nested {{<doc>}} to achieve this.
{code:xml}
<doc>
  <field name="id">1</field>
  <doc name="single_child">
    <field name="id">2</field>
  </doc>
  <field name="children">
    <doc>
      <field name="id">3</field>
    </doc>
    <doc>
      <field name="id">4</field>
    </doc>
  </field>
</doc>
{code}

> XML Loader: support indexing single nested child document
> ---------------------------------------------------------
>
>                 Key: SOLR-16183
>                 URL: https://issues.apache.org/jira/browse/SOLR-16183
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Thomas Corthals
>            Priority: Major
>
> The XML Loader always treats labelled nested children as a "multi-valued pseudo-field", whereas the JSON Loader can also index a single child document as well as an array of 1..n child documents.
> The XML Loader should have a corresponding syntax for a single labelled nested child.



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