[ https://issues.apache.org/jira/browse/LUCENE-10204?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Greg Miller resolved LUCENE-10204. ---------------------------------- Resolution: Won't Fix > Support iteration of sub-matches in join queries (ToParentBlockJoinQuery / > ToChildBlockJoinQuery) > ------------------------------------------------------------------------------------------------- > > Key: LUCENE-10204 > URL: https://issues.apache.org/jira/browse/LUCENE-10204 > Project: Lucene - Core > Issue Type: Improvement > Components: modules/join > Reporter: Greg Miller > Priority: Minor > > It would be nice to be able to iterate over the "sub-matches" in these join > queries for the purpose of faceting (or possibly other use-cases?). > For example, we have a use-case where our query matches on "child" docs, > using a {{ToParentBlockJoinQuery}} to "emit" the associated parents, which > are ultimately added to our match set. But, we want to iterate over the > matching "children" for the purpose of faceting. > To make it concrete, consider searching over a product catalog where "offers" > and "items" are indexed side-by-side, with the offers being represented as > "children" of the parent items. An offer contains information like > "condition" (new vs. used), selling price, etc. for the parent item. If we > want to facet on "condition", we want to observe all children that matched > the query to know if the parent item had a "new" or "used" offer (or both). > This requires iterating over the child matches when faceting, which we cannot > do today since the child hit information isn't retained anywhere. > We can support this by "caching" the child hits in a bitset but there is some > complexity when multiple join queries appear in a query structure (would need > to logically combine various "cached" bitsets using the same boolean > operations as in the original query structure). -- This message was sent by Atlassian Jira (v8.20.7#820007) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org For additional commands, e-mail: issues-h...@lucene.apache.org