jadami10 opened a new issue, #12635:
URL: https://github.com/apache/pinot/issues/12635

   I think the issue starts in 
https://github.com/apache/pinot/blob/3397986ada9b3f978c7d3fa6492986414e4a11d4/pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/creator/impl/SegmentColumnarIndexCreator.java#L142
 We check if the column is `dictEnabledColumn` to ensure we can create the 
inverted index. In that function, we eventually hit 
https://github.com/apache/pinot/blob/41ec20996fdb540222e8fdec3816be59a19b04c1/pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/index/dictionary/DictionaryIndexType.java#L227
 where if you have `optimizeDictionary` set, it just determines if it makes 
sense to create the dictionary or not based on the estimated size. There's no 
consideration if the column has an index that requires the dictionary.


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