msokolov commented on a change in pull request #631: LUCENE-8750: implement 
setMissingValue for ValueSource sortFields
URL: https://github.com/apache/lucene-solr/pull/631#discussion_r271392390
 
 

 ##########
 File path: 
lucene/core/src/java/org/apache/lucene/search/DoubleValuesSource.java
 ##########
 @@ -428,6 +428,16 @@ public DoubleValuesSource rewrite(IndexSearcher searcher) 
throws IOException {
       this.producer = producer;
     }
 
+    @Override
+    public void setMissingValue(Object missingValue) {
+      if (missingValue instanceof Number && getType() == Type.CUSTOM) {
+        this.missingValue = missingValue;
 
 Review comment:
   hm, I forget why I thought I needed that check. I think you're right.  I'll 
just double-check and remove.
   
   > The setMissingValue() API is a bit nasty in general, isn't it? Perhaps we 
should revisit this and clean up type-safety etc in a separate issue.
   
   Yeah -- its ideas about type-safety are a little draconian. I didn't want to 
start making changes there just yet, but can follow up after.
   
   I also didn't particularly like having to setMissingValue both on the 
SortField, and internally on the ComparatorSource, but I'm not sure how to 
clean that up short of eliminating setMissingValue and moving the missingValue 
to getSortField() and the SortField constructors, which seems drastic. Or maybe 
the ComparatorSource should not be static and should read the missingValue from 
its enclosing ValuesSource?

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