rohityadav1993 commented on code in PR #16727:
URL: https://github.com/apache/pinot/pull/16727#discussion_r2436922482


##########
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/creator/impl/SegmentIndexCreationDriverImpl.java:
##########
@@ -171,31 +170,72 @@ public void init(SegmentGeneratorConfig config, 
RecordReader recordReader)
         new TransformPipeline(config.getTableConfig(), config.getSchema()));
   }
 
+  /**
+   * Initialize the driver for columnar segment building using a 
ColumnReaderFactory.
+   * This method sets up the driver to use column-wise input data access 
instead of row-wise.

Review Comment:
   added code comments in the buildColumnar method



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