ankitsultana commented on code in PR #9873:
URL: https://github.com/apache/pinot/pull/9873#discussion_r1067779727


##########
pinot-query-planner/src/main/java/org/apache/pinot/query/planner/partitioning/KeySelector.java:
##########
@@ -37,4 +37,9 @@
   OUT getKey(IN input);
 
   int computeHash(IN input);
+
+  /**
+   * @return the hash-algorithm used for distributing rows
+   */
+  String hashAlgorithm();

Review Comment:
   Yeah this is getting used because to make the colocation decision we need to 
know which hash algorithm is used to distribute the data in a given stage. In 
case a leaf stage decides to hash-distribute, this will set the ColocationKey 
of the receiving stage appropriately by setting the 
`ColocationKey._hashAlgorithm` to `KeySelector#hashAlgorithm()`.



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