walterddr commented on PR #10347:
URL: https://github.com/apache/pinot/pull/10347#issuecomment-1447112086

    
   > I can't find a mechanism that would allow changing the column type from eg 
STRING to BYTES during aggregation
   
   This prompts me to think the real problem to solve is to allow 
`agg(CAST(strCol AS BYTES))`, can I assume this change in ingestion is no 
longer needed if we have support for the above?
   
   > 
   > I guess the ideal would be to have different column types between REALTIME 
and OFFLINE and swap to sketches when moving between tables
   
   


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