Github user moshebla commented on the issue:
https://github.com/apache/lucene-solr/pull/416
I was referring to the '#2'.
Imagine a query for a social network, where all the posts comments made by
a specific user are required, including the ones he commented on, which would
not ,atch the ChildFilter commnent.author:Joe. To display these comments we
would need to bring all the hierarchy above.
In another scenario one might want to get statistics of how many comments,
including replies Joe commented on each post. This can be done using just the
Path, excluding the array index, so isAncestor returns true.
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