gianm commented on a change in pull request #5957: Renamed 
GenericColumnSerializer to ColumnSerializer; 'Generic Column' -> 'Numeric 
Column'; Fixed a few resource leaks in processing; Fixed a bug in 
SingleStringInputDimensionSelector; misc refinements
URL: https://github.com/apache/incubator-druid/pull/5957#discussion_r206791574
 
 

 ##########
 File path: 
processing/src/main/java/io/druid/segment/virtual/SingleStringInputDimensionSelector.java
 ##########
 @@ -153,7 +153,7 @@ public IdLookup idLookup()
   @Override
   public Object getObject()
   {
-    return defaultGetObject();
+    return lookupName(getRow().get(0));
 
 Review comment:
   I'm not sure this will work for empty rows in multi-value dimensions.

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