walterddr opened a new pull request, #8860:
URL: https://github.com/apache/pinot/pull/8860

   previously multi-stage engine assumes no backward compatibility issue with 
existing pinot query server. however we are still depending on pinot-server to 
return `DataTableImplV3` byte format to intermediate multi-stage engine. 
   
   To avoid duplicate ser/de we decided to backward compatible support these 
old ser/de formats 
   - old 8-bytes floating point
   
   also, this 
   - doesn't work with `OBJECT`/`BYTES_ARRAY` type
   - doesn't support `BYTES` type as old bytes are converted into hexString and 
encoded as STRING column.
   


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