jackjlli commented on pull request #5873:
URL: https://github.com/apache/incubator-pinot/pull/5873#issuecomment-681185598


   > Most of these are already tracked in transformers. Invalid columns etc
   
   Plus, the transformers are applied on each of the records. We don't have to 
do the schema validation at every record. All we need to do is to validate the 
schemas only once when a segment is about to be built.
   @kishoreg let me know if you have any other concern.


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