[GitHub] [lucene-solr] diegoceccarelli commented on a change in pull request #300: SOLR-11831: Skip second grouping step if group.limit is 1 (aka Las Vegas Patch)

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[GitHub] [lucene-solr] diegoceccarelli commented on a change in pull request #300: SOLR-11831: Skip second grouping step if group.limit is 1 (aka Las Vegas Patch)

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diegoceccarelli 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_r320201290
 
 

 ##########
 File path: solr/core/src/java/org/apache/solr/search/grouping/distributed/responseprocessor/SkipSecondStepSearchGroupShardResponseProcessor.java
 ##########
 @@ -0,0 +1,116 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.solr.search.grouping.distributed.responseprocessor;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.apache.lucene.search.Sort;
+import org.apache.lucene.search.TotalHits;
+import org.apache.lucene.search.grouping.GroupDocs;
+import org.apache.lucene.search.grouping.SearchGroup;
+import org.apache.lucene.search.grouping.TopGroups;
+import org.apache.lucene.util.BytesRef;
+import org.apache.solr.handler.component.ResponseBuilder;
+import org.apache.solr.handler.component.ShardDoc;
+import org.apache.solr.handler.component.ShardRequest;
+import org.apache.solr.handler.component.ShardResponse;
+import org.apache.solr.search.SolrIndexSearcher;
+import org.apache.solr.search.grouping.GroupingSpecification;
+import org.apache.solr.search.grouping.distributed.shardresultserializer.SearchGroupsResultTransformer;
+
+public class SkipSecondStepSearchGroupShardResponseProcessor extends SearchGroupShardResponseProcessor {
+
+  @Override
+  protected SearchGroupsResultTransformer newSearchGroupsResultTransformer(SolrIndexSearcher solrIndexSearcher) {
+    return new SearchGroupsResultTransformer.SkipSecondStepSearchResultResultTransformer(solrIndexSearcher);
+  }
+
+  @Override
+  protected SearchGroupsContainer newSearchGroupsContainer(ResponseBuilder rb) {
+    return new SkipSecondStepSearchGroupsContainer(rb.getGroupingSpec().getFields());
+  }
+
+  @Override
+  public void process(ResponseBuilder rb, ShardRequest shardRequest) {
+    super.process(rb, shardRequest);
+    TopGroupsShardResponseProcessor.fillResultIds(rb);
+  }
+
+  protected static class SkipSecondStepSearchGroupsContainer extends SearchGroupsContainer {
+
+    private final Map<Object, String> docIdToShard = new HashMap<>();
+
+    public SkipSecondStepSearchGroupsContainer(String[] fields) {
+      super(fields);
+    }
+
+    @Override
+    public void addSearchGroups(ShardResponse srsp, String field, Collection<SearchGroup<BytesRef>> searchGroups) {
+      super.addSearchGroups(srsp, field, searchGroups);
+      for (SearchGroup<BytesRef> searchGroup : searchGroups) {
+        assert(srsp.getShard() != null);
+        docIdToShard.put(searchGroup.topDocSolrId, srsp.getShard());
+      }
+    }
+
+    @Override
+    public void addMergedSearchGroups(ResponseBuilder rb, String groupField, Collection<SearchGroup<BytesRef>> mergedTopGroups ) {
+      // TODO: add comment or javadoc re: why this method is overridden as a no-op
+    }
+
+    @Override
+    public void addSearchGroupToShards(ResponseBuilder rb, String groupField, Collection<SearchGroup<BytesRef>> mergedTopGroups) {
+      super.addSearchGroupToShards(rb, groupField, mergedTopGroups);
+
+      final GroupingSpecification groupingSpecification = rb.getGroupingSpec();
+      final Sort groupSort = groupingSpecification.getGroupSortSpec().getSort();
+
+      GroupDocs<BytesRef>[] groups = new GroupDocs[mergedTopGroups.size()];
+
+      // This is the max score found in any document on any group
+      float maxScore = 0;
+      int index = 0;
+
+      for (SearchGroup<BytesRef> group : mergedTopGroups) {
+        maxScore = Math.max(maxScore, group.topDocScore);
+        final String shard = docIdToShard.get(group.topDocSolrId);
+        assert(shard != null);
+        final ShardDoc sdoc = new ShardDoc();
+        sdoc.score = group.topDocScore;
+        sdoc.id = group.topDocSolrId;
+        sdoc.shard = shard;
+
+        groups[index++] = new GroupDocs<>(group.topDocScore,
+            group.topDocScore,
+            new TotalHits(1, TotalHits.Relation.EQUAL_TO), /* we don't know the actual number of hits in the group- we set it to 1 as we only keep track of the top doc */
+            new ShardDoc[] { sdoc }, /* only top doc */
+            group.groupValue,
+            group.sortValues);
+      }
+      TopGroups<BytesRef> topMergedGroups = new TopGroups<BytesRef>(groupSort.getSort(),
+          rb.getGroupingSpec().getWithinGroupSortSpec().getSort().getSort(),
+          0, /*Set totalHitCount to 0 as we can't computed it as is */
+          0, /*Set totalGroupedHitCount to 0 as we can't computed it as is*/
+          groups,
+          maxScore);
 
 Review comment:
   ok

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