[SOLR-15069] child doc transformer should make parentFilter obsolete

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 8.8
• Assignee: David Smiley
• Reporter: David Smiley
• Created: 05/Jan/21 20:31
• Updated: 13/Feb/21 00:08
• Resolved: 06/Jan/21 23:08

Description

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.

Issue Links

• is required by: SOLR-14923 Indexing performance is unacceptable when child documents are involved
• links to: GitHub Pull Request #2181