Prithvi S created SOLR-18421:
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Summary: Expose Lucene ParentsChildrenBlockJoinQuery from
{!child} (parent+child query, childLimit per parent)
Key: SOLR-18421
URL: https://issues.apache.org/jira/browse/SOLR-18421
Project: Solr
Issue Type: New Feature
Components: query parsers
Reporter: Prithvi S
Lucene 10.4 added ParentsChildrenBlockJoinQuery (GITHUB#14565): match parent
docs and child docs in the same block-join query, with an optional
childLimitPerParent cap.
Solr already depends on Lucene 10.4.0 (gradle/libs.versions.toml) and already
wraps ToParentBlockJoinQuery / ToChildBlockJoinQuery as \{!parent} / \{!child},
but never uses ParentsChildrenBlockJoinQuery.
*Current limitation*
{!child} takes a parent query and returns *all* children of those parents.
There is no way to:
* also filter which children match
* cap the number of matching children per parent at *query* time
The [child] transformer \{{limit}} param is response decoration of
already-matched parents, not a search-time limit.
*Proposed API (backward compatible)*
{code:java}
q=\{!child parentPath="/" childQuery=$cq childLimit=2}title:solr
&cq=comments:lucene
{code}
Omit childQuery/childLimit -> existing \{!child} behavior.
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