ercsonusharma commented on code in PR #3418:
URL: https://github.com/apache/solr/pull/3418#discussion_r2453916641


##########
solr/core/src/java/org/apache/solr/handler/component/CombinedQueryComponent.java:
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@@ -0,0 +1,629 @@
+/*
+ * 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.handler.component;
+
+import static java.lang.Math.max;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.io.StringWriter;
+import java.lang.invoke.MethodHandles;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.stream.Collectors;
+import org.apache.lucene.search.Explanation;
+import org.apache.lucene.search.Sort;
+import org.apache.lucene.search.SortField;
+import org.apache.solr.client.solrj.SolrServerException;
+import org.apache.solr.common.SolrDocument;
+import org.apache.solr.common.SolrDocumentList;
+import org.apache.solr.common.SolrException;
+import org.apache.solr.common.params.CombinerParams;
+import org.apache.solr.common.params.CursorMarkParams;
+import org.apache.solr.common.params.GroupParams;
+import org.apache.solr.common.params.ShardParams;
+import org.apache.solr.common.params.SolrParams;
+import org.apache.solr.common.util.NamedList;
+import org.apache.solr.common.util.SimpleOrderedMap;
+import org.apache.solr.common.util.StrUtils;
+import org.apache.solr.core.SolrCore;
+import org.apache.solr.response.BasicResultContext;
+import org.apache.solr.response.ResultContext;
+import org.apache.solr.response.SolrQueryResponse;
+import org.apache.solr.schema.IndexSchema;
+import org.apache.solr.schema.SchemaField;
+import org.apache.solr.search.DocListAndSet;
+import org.apache.solr.search.QueryResult;
+import org.apache.solr.search.SolrReturnFields;
+import org.apache.solr.search.SortSpec;
+import org.apache.solr.search.combine.QueryAndResponseCombiner;
+import org.apache.solr.search.combine.ReciprocalRankFusion;
+import org.apache.solr.util.SolrResponseUtil;
+import org.apache.solr.util.plugin.SolrCoreAware;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * The CombinedQueryComponent class extends QueryComponent and provides 
support for executing
+ * multiple queries and combining their results.
+ */
+public class CombinedQueryComponent extends QueryComponent implements 
SolrCoreAware {
+
+  private static final Logger log = 
LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
+  public static final String COMPONENT_NAME = "combined_query";
+  protected NamedList<?> initParams;
+  private final Map<String, QueryAndResponseCombiner> combiners = new 
HashMap<>();
+  private int maxCombinerQueries;
+  private static final String RESPONSE_PER_QUERY_KEY = "response_per_query";
+
+  @Override
+  public void init(NamedList<?> args) {
+    super.init(args);
+    this.initParams = args;
+    this.maxCombinerQueries = CombinerParams.DEFAULT_MAX_COMBINER_QUERIES;
+  }
+
+  @Override
+  public void inform(SolrCore core) {
+    for (Map.Entry<String, ?> initEntry : initParams) {
+      if ("combiners".equals(initEntry.getKey())
+          && initEntry.getValue() instanceof NamedList<?> all) {
+        for (int i = 0; i < all.size(); i++) {
+          String name = all.getName(i);
+          NamedList<?> combinerConfig = (NamedList<?>) all.getVal(i);
+          String className = (String) combinerConfig.get("class");
+          QueryAndResponseCombiner combiner =
+              core.getResourceLoader().newInstance(className, 
QueryAndResponseCombiner.class);
+          combiner.init(combinerConfig);
+          combiners.compute(
+              name,
+              (k, existingCombiner) -> {
+                if (existingCombiner == null) {
+                  return combiner;
+                }
+                throw new SolrException(
+                    SolrException.ErrorCode.BAD_REQUEST,
+                    "Found more than one combiner with same name");
+              });
+        }
+      }
+    }
+    Object maxQueries = initParams.get("maxCombinerQueries");
+    if (maxQueries != null) {
+      this.maxCombinerQueries = Integer.parseInt(maxQueries.toString());
+    }
+    combiners.computeIfAbsent(
+        CombinerParams.RECIPROCAL_RANK_FUSION,
+        key -> {
+          ReciprocalRankFusion reciprocalRankFusion = new 
ReciprocalRankFusion();
+          reciprocalRankFusion.init(initParams);
+          return reciprocalRankFusion;
+        });
+  }
+
+  @Override
+  protected boolean isForceDistributed() {
+    return true;
+  }
+
+  /**
+   * Overrides the prepare method to handle combined queries.
+   *
+   * @param rb the ResponseBuilder to prepare
+   * @throws IOException if an I/O error occurs during preparation
+   */
+  @Override
+  public void prepare(ResponseBuilder rb) throws IOException {
+    if (rb instanceof CombinedQueryResponseBuilder crb) {
+      SolrParams params = crb.req.getParams();
+      if (params.get(CursorMarkParams.CURSOR_MARK_PARAM) != null
+          || params.getBool(GroupParams.GROUP, false)) {
+        throw new SolrException(
+            SolrException.ErrorCode.BAD_REQUEST, "Unsupported functionality 
for Combined Queries.");
+      }
+      String[] queriesToCombineKeys = 
params.getParams(CombinerParams.COMBINER_QUERY);
+      if (queriesToCombineKeys.length > maxCombinerQueries) {
+        throw new SolrException(
+            SolrException.ErrorCode.BAD_REQUEST,
+            "Too many queries to combine: limit is " + maxCombinerQueries);
+      }
+      for (String queryKey : queriesToCombineKeys) {
+        final var unparsedQuery = params.get(queryKey);
+        ResponseBuilder rbNew = new ResponseBuilder(rb.req, new 
SolrQueryResponse(), rb.components);
+        rbNew.setQueryString(unparsedQuery);
+        super.prepare(rbNew);
+        crb.setFilters(rbNew.getFilters());
+        crb.responseBuilders.add(rbNew);
+      }
+    }
+    super.prepare(rb);
+  }
+
+  /**
+   * Overrides the process method to handle CombinedQueryResponseBuilder 
instances. This method
+   * processes the responses from multiple queries, combines them using the 
specified
+   * QueryAndResponseCombiner strategy, and sets the appropriate results and 
metadata in the
+   * CombinedQueryResponseBuilder.
+   *
+   * @param rb the ResponseBuilder object to process
+   * @throws IOException if an I/O error occurs during processing
+   */
+  @Override
+  @SuppressWarnings("unchecked")
+  public void process(ResponseBuilder rb) throws IOException {

Review Comment:
   Sorry, took longer to reply.
   The forced distributed would anyway enable the shard call 
[(isShard=true)](https://github.com/apache/solr/blob/main/solr/core/src/java/org/apache/solr/handler/component/SearchHandler.java#L565).
   
   >  then why wouldn't the logic just pass-through as normal
   
   The `process()` method is directly communicating with the Searcher as we 
need to process each query at the shard searcher level. If you would look at 
the method override, it is also creating the combined docSet across queries 
other than few other metadata, required for merging the docs finally across the 
shard at the coordinator level. 



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