dsmiley commented on a change in pull request #1407: Use 
QueryUtils.combineQueryAndFilter more
URL: https://github.com/apache/lucene-solr/pull/1407#discussion_r406423883
 
 

 ##########
 File path: solr/core/src/java/org/apache/solr/search/QueryUtils.java
 ##########
 @@ -151,7 +151,7 @@ public static BooleanQuery build(BooleanQuery.Builder 
builder, QParser parser) {
    * If neither are null then we combine with a BooleanQuery.
    */
   public static Query combineQueryAndFilter(Query scoreQuery, Query 
filterQuery) {
-    if (scoreQuery == null) {
+    if (scoreQuery == null || scoreQuery instanceof MatchAllDocsQuery) {
 
 Review comment:
   Yes I felt this was an internal detail not worth mentioning.  I pondered how 
I would document it but felt the javadocs of this method are eclipsing the 
relative simplicity of what the code does.  I don't think it's worth bothering 
RE matchAllDocsQuery instantiation.  Really there should be a static singleton 
for MADQ and when that happens this'd be a non-issue.  It's so minor.

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