siddharthteotia commented on a change in pull request #7898:
URL: https://github.com/apache/pinot/pull/7898#discussion_r768288135



##########
File path: 
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/index/loader/defaultcolumn/DefaultColumnHandler.java
##########
@@ -28,4 +28,10 @@
    */
   void updateDefaultColumns()
       throws Exception;
+
+  /**

Review comment:
       (nit) The comment is a bit misleading. The DefaultColumnHandler also 
adds new column(s) with the default value and fwd index, dictionary if the 
schema has extra column(s) but segment disk metadata doesn't have them. In 
addition to this, yes the default value of auto-generated columns can also be 
updated by the handler if need be as you mentioned in javadoc




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