madrob commented on a change in pull request #267:
URL: https://github.com/apache/solr/pull/267#discussion_r696140459



##########
File path: 
solr/core/src/test/org/apache/solr/handler/component/MockSortSpecBuilder.java
##########
@@ -0,0 +1,36 @@
+package org.apache.solr.handler.component;

Review comment:
       license header

##########
File path: 
solr/core/src/test/org/apache/solr/handler/component/MockResponseBuilder.java
##########
@@ -0,0 +1,54 @@
+package org.apache.solr.handler.component;

Review comment:
       license header

##########
File path: 
solr/core/src/java/org/apache/solr/handler/component/QueryComponent.java
##########
@@ -955,11 +955,15 @@ protected void mergeIds(ResponseBuilder rb, ShardRequest 
sreq) {
 
         @SuppressWarnings("unchecked")
         NamedList<List<Object>> sortFieldValues = 
(NamedList<List<Object>>)(srsp.getSolrResponse().getResponse().get("sort_values"));
-        if ((null == sortFieldValues || sortFieldValues.size()==0) && // we 
bypass merging this response only if it's partial itself
-                            thisResponseIsPartial) { // but not the previous 
one!!
-          continue; //fsv timeout yields empty sort_vlaues
+        if (null == sortFieldValues) {
+          sortFieldValues = new NamedList<>();
         }
-        NamedList<List<Object>> unmarshalledSortFieldValues = 
unmarshalSortValues(ss, sortFieldValues, schema);
+        boolean needsUnmarshalling = ss.includesNonScoreOrDocField();
+        // skip merging results for this shard if the sortSpec sort values 
need to be marshalled but the sortFieldValues is empty.
+        if (thisResponseIsPartial && sortFieldValues.size() == 0 && 
needsUnmarshalling) {
+          continue;
+        }
+        NamedList<List<Object>> unmarshalledSortFieldValues = 
needsUnmarshalling ? unmarshalSortValues(ss, sortFieldValues, schema) : new 
NamedList<>();

Review comment:
       They do! I am super happy with these, and they help me understand it 
much better than I thought I got it before.




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