mcvsubbu commented on a change in pull request #6021:
URL: https://github.com/apache/incubator-pinot/pull/6021#discussion_r489089813



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File path: 
pinot-core/src/main/java/org/apache/pinot/core/segment/processing/framework/SegmentMapper.java
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@@ -100,8 +110,11 @@ public void map()
       }
 
       // Partitioning
-      // TODO: 2 step partitioner. 1) Apply custom partitioner 2) Apply table 
config partitioner. Combine both to get final partition.
-      String partition = _partitioner.getPartition(reusableRow);
+      int p = 0;
+      for (Partitioner partitioner : _partitioners) {
+        partitions[p++] = partitioner.getPartition(reusableRow);
+      }
+      String partition = StringUtil.join("_", partitions);

Review comment:
       The `"_"` here is very significant, right? It cannot be changed, and has 
to be used the same way across multiple components. Could you please declare it 
as. a final string in some Constants class as a partition separator or 
something? 
   
   And then re-use in tests
   
   thanks




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