jasperjiaguo commented on a change in pull request #4270: skip the inverted 
index generation
URL: https://github.com/apache/incubator-pinot/pull/4270#discussion_r291814170
 
 

 ##########
 File path: 
pinot-core/src/main/java/org/apache/pinot/core/segment/creator/impl/SegmentColumnarIndexCreator.java
 ##########
 @@ -158,8 +158,12 @@ public void init(SegmentGeneratorConfig 
segmentCreationSpec, SegmentIndexCreatio
         }
 
         // Initialize inverted index creator
+        // Do not created inverted index if sorted, clean up 
invertedIndexColumns
         if (invertedIndexColumns.contains(columnName)) {
-          if (segmentCreationSpec.isOnHeap()) {
+          if (indexCreationInfo.isSorted()){
+            invertedIndexColumns.remove(columnName);
+            //config.getInvertedIndexCreationColumns().remove(columnName); Do 
we clean up config?
 
 Review comment:
   I tested the sorted-column + inverted index case and it did skip the 
inverted index generation. The HAS_INVERTED_INDEX flag is also good.

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