cpoerschke commented on a change in pull request #300: SOLR-11831: Skip second
grouping step if group.limit is 1 (aka Las Vegas Patch)
URL: https://github.com/apache/lucene-solr/pull/300#discussion_r321740457
##########
File path:
lucene/grouping/src/java/org/apache/lucene/search/grouping/FirstPassGroupingCollector.java
##########
@@ -139,10 +139,18 @@ public ScoreMode scoreMode() {
// System.out.println(" group=" + (group.groupValue == null ? "null" :
group.groupValue.toString()));
SearchGroup<T> searchGroup = new SearchGroup<>();
searchGroup.groupValue = group.groupValue;
+ // We pass this around so that we can get the corresponding solr id when
serializing the search group to send to the federator
+ searchGroup.topDocLuceneId = group.topDoc;
searchGroup.sortValues = new Object[sortFieldCount];
for(int sortFieldIDX=0;sortFieldIDX<sortFieldCount;sortFieldIDX++) {
searchGroup.sortValues[sortFieldIDX] =
comparators[sortFieldIDX].value(group.comparatorSlot);
}
+ // TODO: It should be possible to extend this to handle more than one
FieldComparator and other types
Review comment:
TODO item here w.r.t. sort field count being one. If it's not too difficult
extending to multiples might be nice to do, or it could be deferred until later
(and `GroupingSpecification.validate` would for now throw if there's more than
one). Either way let's add test coverage and documentation.
Semi-related, the
https://lucene.apache.org/solr/guide/8_1/common-query-parameters.html#sort-parameter
documentation reminded me that sorting by functions is possible. If (as the
code snippet here seems to suggest) `group.skip.second.step=true` currently
assumes that the sort element is a field (and not a function) then let's
include that in the documentation, validation code and test coverage. Support
for the not-yet-supported things could of course be added subsequently in
future. Does that kind of make sense?
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