hqx871 commented on code in PR #13303:
URL: https://github.com/apache/druid/pull/13303#discussion_r1066515503


##########
core/src/main/java/org/apache/druid/indexer/partitions/SingleDimensionPartitionsSpec.java:
##########
@@ -146,6 +154,44 @@ public String 
getForceGuaranteedRollupIncompatiblityReason()
     return FORCE_GUARANTEED_ROLLUP_COMPATIBLE;
   }
 
+  @Override
+  public List<List<String>> getDimensionGroupingSet(DimensionsSpec 
dimensionsSpec)

Review Comment:
   Hi @kfaraz, this method does not always returns a singleton list, as the 
single_dim will try every dimension from  dimensionsSpec.getDimensions() to 
find the best when the partitionDimension is not set. 



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