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https://issues.apache.org/jira/browse/SOLR-15069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17260100#comment-17260100
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ASF subversion and git services commented on SOLR-15069:
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Commit 7674de3e1a2e552ce40cf39611034d57aac052ee in lucene-solr's branch
refs/heads/branch_8x from David Smiley
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=7674de3 ]
SOLR-15069: [child parentFilter=...] is now optional (#2181)
(cherry picked from commit 31476258906716b0ae95b65ace8a5c2f7b113871)
> child doc transformer should make parentFilter obsolete
> -------------------------------------------------------
>
> Key: SOLR-15069
> URL: https://issues.apache.org/jira/browse/SOLR-15069
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: David Smiley
> Assignee: David Smiley
> Priority: Major
> Time Spent: 1h
> Remaining Estimate: 0h
>
> The parentFilter param to \[child] was once required, and then made only
> optional if you have a \_nest_path_ field, but I think it can be optional
> (perhaps obsolete) altogether. All we have to do is grab the uniqueKey field
> from the document to be transformed, look this up in the \_root_ field, and
> you'll get the internal Lucene docId of the first child doc. No problem, and
> quick.
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