Github user ilaygit commented on a diff in the pull request:
https://github.com/apache/lucene-solr/pull/162#discussion_r185438730
--- Diff:
solr/core/src/java/org/apache/solr/handler/component/QueryComponent.java ---
@@ -1414,10 +1267,17 @@ private void
doProcessGroupedDistributedSearchFirstPhase(ResponseBuilder rb, Que
.setSearcher(searcher);
for (String field : groupingSpec.getFields()) {
+ final int topNGroups;
+ Query query = cmd.getQuery();
+ if (query instanceof AbstractReRankQuery){
+ topNGroups = cmd.getOffset() +
((AbstractReRankQuery)query).getReRankDocs();
+ } else {
+ topNGroups = cmd.getOffset() + cmd.getLen();
+ }
topsGroupsActionBuilder.addCommandField(new
SearchGroupsFieldCommand.Builder()
.setField(schema.getField(field))
.setGroupSort(groupingSpec.getGroupSort())
- .setTopNGroups(cmd.getOffset() + cmd.getLen())
--- End diff --
Is it reRanking with respect to the "start" param in the solr query?
Looks like the original LTR plugin is supposed to reRank top K irrespective
of the offset.
ref.http://lucene.472066.n3.nabble.com/Learning-to-Rank-LTR-with-grouping-td4366691i20.html#a4387929
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