Github user moshebla commented on a diff in the pull request:
https://github.com/apache/lucene-solr/pull/416#discussion_r206184346
--- Diff:
solr/core/src/java/org/apache/solr/response/transform/DeeplyNestedChildDocTransformer.java
---
@@ -0,0 +1,224 @@
+/*
+ * 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.response.transform;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import com.google.common.collect.ArrayListMultimap;
+import com.google.common.collect.Multimap;
+import org.apache.lucene.index.DocValues;
+import org.apache.lucene.index.IndexableField;
+import org.apache.lucene.index.LeafReaderContext;
+import org.apache.lucene.index.SortedDocValues;
+import org.apache.lucene.search.Query;
+import org.apache.lucene.search.Sort;
+import org.apache.lucene.search.SortField;
+import org.apache.lucene.search.join.BitSetProducer;
+import org.apache.lucene.search.join.ToChildBlockJoinQuery;
+import org.apache.lucene.util.BytesRef;
+import org.apache.solr.common.SolrDocument;
+import org.apache.solr.request.SolrQueryRequest;
+import org.apache.solr.response.DocsStreamer;
+import org.apache.solr.schema.FieldType;
+import org.apache.solr.schema.IndexSchema;
+import org.apache.solr.schema.SchemaField;
+import org.apache.solr.search.DocIterator;
+import org.apache.solr.search.DocList;
+import org.apache.solr.search.SolrDocumentFetcher;
+import org.apache.solr.search.SolrIndexSearcher;
+import org.apache.solr.search.SolrReturnFields;
+
+import static
org.apache.solr.response.transform.ChildDocTransformerFactory.NUM_SEP_CHAR;
+import static
org.apache.solr.response.transform.ChildDocTransformerFactory.PATH_SEP_CHAR;
+import static org.apache.solr.schema.IndexSchema.NEST_PATH_FIELD_NAME;
+
+class DeeplyNestedChildDocTransformer extends DocTransformer {
--- End diff --
Would the transformer need to support the old method of adding
childDocuments to the _childDocuments_ field?
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