mayankshriv opened a new issue #6334:
URL: https://github.com/apache/incubator-pinot/issues/6334


   We ran into an issue where SegmentPurger failed due to schema evolution as 
follows:
   
   - New columns were added into the schema.
   - Table index was updated to have inverted index on some of the newly added 
columns.
   - An explicit backfill was not performed.
   
   When the SegmentPurger tried to purge older segments, it failed with the 
following error:
   `java.lang.IllegalStateException: Cannot create inverted index for column: 
<xxx> because it is not in schema`
   
   This is likely because SegmentPurger used the schema in the segment as 
opposed to the schema in the controller.
   It would be desirable for SegmentPurger to gracefully handle this scenario.


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