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https://issues.apache.org/jira/browse/SOLR-16183?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17694611#comment-17694611
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Thomas Corthals commented on SOLR-16183:
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The {{name="child"}} on the doc is currently ignored. Your example creates an
array named {{single_child}} which contains a doc with {{id}} {{{}3{}}}.
{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">*:*</str>
<str name="indent">true</str>
<str name="fl">id,single_child,[child]</str>
<str name="q.op">OR</str>
<str name="fq">id:1</str>
<str name="wt">xml</str>
<str name="_">1677597034063</str>
</lst>
</lst>
<result name="response" numFound="1" start="0" numFoundExact="true">
<doc>
<str name="id">1</str>
<arr name="single_child">
<doc>
<str name="id">3</str></doc>
</arr></doc>
</result>
</response> {code}
I wouldn't change that behaviour because that would break backward
compatibility.
> 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
> Reporter: Thomas Corthals
> Priority: Major
> Labels: newbie
>
> 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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